Customer Feedback Survey vs. Mystery Shopping: Which Is Better?

There are two top methodologies for gathering data on voice of the customer (VoC)—the customer feedback survey and mystery shopping. But is one more accurate than the other? What are the advantages and limitations of each? And which one will yield the best return on investment (ROI) for businesses seeking to improve and optimize their CX (customer experience)? 

This article will explore the significance of methodology in VoC research. It will also evaluate customer feedback surveys and mystery shopping individually, as well as comparatively. Then, with this in mind, the best strategy will be revealed. (The answer may be surprising.) 

Let’s begin our comparison. 

Why Methodology Matters in Voice of the Customer

What’s so important about voice of the customer research? A company may have great offerings, a strategic business model, and attractive marketing—but unless customers have a genuinely positive experience, this business will only work in theory. 

VoC is the process of gathering CX data from a variety of sources, analyzing it, and then making calculated suggestions for improvement. Additionally, after adjustments have been made, further VoC research is conducted to evaluate the effectiveness of those initiatives. This CX data focuses on consumers’ stated wants, needs, expectations, and experiences of the products and/or services a business provides. 

Without effective research methodologies, the data—and therefore the conclusions drawn from that data—is unreliable. Thus, utilizing tried-and-true tactics for collecting VoC data is critical to a business’s success. 

There are a number of reliable VoC methodologies available, including the following: 

• Direct observations by management
• Customer feedback surveys
• Online reviews and commentary
• Focus groups and interviews
• Customer-facing employees’ impressions
• Meta-analysis (drawing conclusions from data the company already has access to)
• Professional third-party analysis (including mystery shopping)

This article will focus on two of the top performers in terms of value: customer feedback surveys and mystery shopping. 

At a Glance: Customer Feedback Surveys vs. Mystery Shopping

To begin, here is a brief comparison chart showing the key advantages and major limitations of each of these VoC research methodologies: 

Key Advantages of the Customer Feedback Survey

First, a definition: the customer feedback survey is a short questionnaire for patrons to provide their opinion on a business’s offerings and operations. These surveys typically include questions about the following: 

• Overall satisfaction levels (usually on a scale of highly satisfied to highly unsatisfied)
• Likelihood to continue shopping at this business (typically on a Likert-style scale of one to five)
• Recommendations to others (also known as NPS or net promoter score)
• Demographic information (optional)
• Open-ended commentary (for the survey-taker to leave their own unique feedback)

So what makes this methodology so useful to businesses investigating their VoC?

Authentic

Real-life customers are filling out these surveys—so the business is getting their intelligence straight from the horse’s mouth, so to speak. They can say directly whether or not they were satisfied with their service, and even offer a few details about why they felt this way. 

Personal

Surveys provide insight into the real, personal experiences of these customers—not just what executives imagine is occurring. If needed, a business can even follow up with them on a one-on-one basis to collect more information, get consent for using their response as a testimonial, or remedy an issue. 

Experiential

Moreover, surveys always yield N-of-1 data, meaning that the experiences described in a single result actually happened to an individual, rather than to a vague collective. This can help determine outliers, unusual scenarios, and even unique problems. 

With these distinct advantages, it’s clear that customer feedback is an essential part of a comprehensive VoC program. 

Customer Feedback Survey Limitations

Unfortunately, what makes the customer feedback survey so powerful is also what makes it less reliable—as demonstrated in these key limitations. 

Nonprofessional

Survey-takers are customers… not experts at customer experience design. As such, they can only provide their feedback as a lay consumer. This greatly affects the reliability of the raw data, as many responses will need to be thrown out. Some surveys may be left incomplete, others could use poor grammar that makes them unclear or even incomprehensible, and at least a few will be otherwise not applicable. 

Ultimately, the amount of usable data that can be gathered from these surveys is smaller than expected—and less than with other methodologies. 

Self-Selecting

Customer feedback surveys are typically not a reliable sampling of all customers. Chances are that the only people who fill out a business’s survey are those with the time, patience, and willingness to do so. Additionally, survey-takers typically fall within similar demographics, so the end data may not be all-encompassing of the customers to which the business caters. The results also won’t include data on non-customers and not-yet-customers.

Overall, self-selection bias is a major limitation for survey data, severely narrowing the feedback this methodology gathers.

Skewed to Extremes

Similarly, surveys are generally skewed to one end of a spectrum or the other. Happy customers are far more likely to fill out a survey when asked than moderately-satisfied customers. On the other hand, customers who feel they had a terrible experience may be overeager to give their critical feedback. Therefore, conclusions drawn from this methodology will be based on data that is likely more extreme than reality. 

Despite these limitations, customer feedback surveys are still a powerful part of VoC research. However, the results should be taken with a grain of salt—or considered alongside the conclusions from other methodologies… like mystery shopping. 

Top Benefits of Mystery Shopping

Surprisingly, the customer feedback survey and the mystery shop (or CX evaluation) look the same on the surface: an individual has an experience with a business, then provides commentary on its effectiveness. However, they represent different sides of the same coin—as demonstrated in the notable advantages below. 

Professional

Unlike surveys, CX evaluations are performed by skilled professionals. These experts understand what the businesses that hired them are looking for: insight into the customer experience and information on how to optimize and capitalize on it. Therefore, mystery shoppers will fill out a detailed and comprehensive report on their findings. Businesses can count on these reports to be packed with valuable VoC information that isn’t vague or emotional like with surveys. 

Structured

Likewise, if a business deploys all its mystery shoppers with the same evaluation rubric, data from any number of shops can be aggregated to deliver even more insight. For example, a franchised retailer can use mystery shopping to evaluate CX in the same way at each of their locations. Then, they can compare metrics for the highest- and lowest-performing ones, identify key issues, and make company-wide changes that boost profitability across the board. 

Data-Driven

The data provided by mystery shoppers is reliable, accurate, and—most importantly—actionable. Although the number of individual CX evaluations may be smaller than the number of surveys received, the information can be more impactful on a business’s daily operations. This is due in part to the fact that mystery shoppers can provide in-depth detail on their experiences. Customer surveys have to be short to get enough responses, so they have to prioritize certain data points over others. That’s not the case with mystery shopping. 

As demonstrated, mystery shopping packs a punch in terms of VoC research. However, it’s not without limitations of its own. 

Limitations of Mystery Shopping

Ultimately, any methodology has its advantages and disadvantages—and mystery shopping is no different. Let’s explore. 

Resource-Intensive

When it comes to resources, the point goes to the customer feedback survey, which requires fairly minimal effort. Contrastingly, a quality mystery shopping program needs quite a bit of maintenance—especially when handled entirely in house. Setting up systems, managing employees, sorting through reports, and then strategizing future shops… It’s true that professional CX evaluations can consume plenty of time and capital. 

Smaller Sample Sizes

Unless a business can afford to take on massive mystery shopping initiatives—or hire a well-equipped third-party agency—there simply won’t be as many cases to draw from as customer surveys. These CX evaluations happen at a much slower pace than quick-and-dirty surveys. Thus, this methodology sees much less action. And with fewer cases to explore, the likelihood of capturing every customer experience is lower. 

Objective

Here’s where the two strategies really diverge from one another: surveys yield intimate responses from real customers, while mystery shops should really only provide unbiased data. Why does this matter? Because CX evaluators aren’t real customers. To protect the integrity of the results, they should strive to be objective. Thus, they can only speculate on what makes loyal customers love a brand so much that they’ll choose it over other cheaper, quicker, or easier options. Only real fans can attest to their emotional connections with a company. 

In short, although mystery shopping is a compelling strategy for VoC research, it’s not without its shortcomings. 

For Best Results: Use Both

If each methodology is as problematic as it is powerful, which VoC method should a business choose if they want to improve their CX? The solution is clear—use both. 

As shown, the customer feedback survey and mystery shopping are fairly complementary in nature. To compensate for the disadvantages of one, leverage the power of the other. In fact, combining these methodologies can create effective synergy that will yield better results than either on its own. 

Partner with a CX Agency That Does It All 

Alternatively, businesses that want to get the most out of their VoC investigations can choose to partner with a CX agency like IntelliShop. 

With a nationwide network of trained mystery shoppers and the top-level experience of CX experts, IntelliShop can leverage these methodologies—as well as others—to provide powerful, actionable, and data-driven insight. Plus, because IntelliShop is a third party, evaluators can be truly unbiased—and businesses don’t have to go through the hassle of creating and managing an internal VoC department. 

If you want to maintain, optimize, and capitalize on your business’s customer experience, it’s time to take a closer look at IntelliShop. Learn more and see how we can elevate you to the next level of success. 

Improve Your VoC Data with These Powerful Methodologies

In the end, there is no one-size-fits-all answer when it comes to VoC research. But there is a smart one: balance. Customer feedback surveys offer authentic, personal insights straight from the source—while mystery shopping delivers professional, structured, and highly-actionable data. 

When used together, they provide a more complete picture of the customer experience. This allows businesses to address gaps, amplify strengths, and drive real improvement. The key, of course, is knowing how to use each method strategically. Then, it’s only a matter of time until a business sees real improvement where it matters: the bottom line.