During the most recent holiday season, Amazon‘s newest set of devices, the Echo and Echo Dot smart speakers, were wildly popular – mainly due to the AI assistant Alexa, which can play music, answer questions and connect to devices in your home.

With all the media attention surrounding Alexa, we wondered if the Echo devices were Amazon’s most successful consumer electronics product launches. Compared to other devices made by Amazon (Fire tablet, Fire TV Stick, Kindle, etc.), did the Echo dominate?

Unfortunately, we don’t have access to Amazon sales data for each device; we decided to measure popularity indirectly. How many reviews on Amazon does the product have and how fast (or slow) does the number of reviews grow? Using the Datafiniti product database, we looked up the number of reviews for Amazon products and filled in the gaps with data from the Internet Archive when necessary.

To our surprise, the Echo is far from being Amazon’s most successful product when it comes to the dramatic growth of reviews. That title belongs to the Fire TV Stick. The small, cheap streaming television device appears to be exploding in popularity faster than any other Amazon product.

We captured data on customer reviews for a selection of Amazon products released over the years. Below we’ve plotted cumulative number reviews over time, showing which products are in-demand and how quickly their reviews grew.

Datafiniti used its Product Data to analyze 1,000,000 reviews for Amazon products and determine the cumulative total customer reviews for each product over time.

When it comes absolute number of reviews, the Fire TV Stick and the newest Fire tablet separate from the pack. Other earlier products, such as the Kindle Keyboard and the first generation Fire tablet, experienced relatively significant growth. The products then stagnated with the launch of newer versions.

This directs our attention towards Amazon products that were on the market longer, with more time to accumulate reviews. You may notice that a number of products that currently do not have many reviews, but are gaining traction.

To isolate which Amazon products are currently growing in popularity the most, we can zoom in on reviews over the past 90 days. Again, some products may have no new reviews. The products were either released years ago or are no longer sold by Amazon.

Datafiniti used its Product Data to analyze 1,000,000 reviews for Amazon products and determine the number for each product within the last 90 days.

The Fire TV Stick with Alexa ranks first on this list in the highest number of reviews from the past 90 days. This ranking indicates it was a top selling item this past holiday season.

As we stated earlier, some of these products have been on the market for many months. Others, such as the Fire TV Stick with Alexa, are brand new. Which products were hot sellers from the get-go?

To compare Amazon products riding the wave of popularity following their release, we analyzed their first 90 days of review data.

Datafiniti used its Product Data to analyze 1,000,000 reviews for Amazon products and determine the number for each product 90 days after the launch.

It is important to note a unique selling point of the Echo. It had a limited release on November 6, 2014, with availability by invitation only. During this time customers were able to leave reviews, but the information was not available to the general public. On June 23, 2015, it became available for purchase to all customers. Our analysis is looking at 90 days following this public launch.

A lot of the same products dominate this list. These products include the Fire TV Stick with Alexa (again) as the most popular product. The Fire TV Stick had, even more, reviews than the original version. The influx of reviews makes sense as it is the same price. However, it now offers new features such as voice-controlled technology. We also see the Echo Dot overtake the Fire HD 8, again highlighting the popularity of Alexa. Some of the notably sought-after and older products sit comfortably in the middle of the group; these products include the original Fire tablet and the Kindle Keyboard E-reader. Less popular products like the previous generation Fire tablet, the Echo Tap, and the Fire TV bring up the rear.

The rank of the Fire Phone on this list demonstrates that number of reviews is not a perfect analog for popularity. Most of the reviews it generated the year it was available were negative; it’s average rating rarely hovered over three stars. The product experiment was notoriously and ultimately labeled a failure.

So, how does the price of an item correlate with its popularity (as measured by number of reviews)? In the below chart, we show the price of the device versus the number of reviews 90 days after launch:

Datafiniti used its Product Data to analyze 1,000,000 reviews for Amazon products and determine the number for each product 90 days after the launch compared to the price.

Prices reflect the listed price at the time of product launch. The price for the Fire Phone was listed as $649 online, but with a contract, most customers only paid $199.99.

Here we can see a strong trend in cheaper devices that get more reviews after their launch. Considering their top-level performance and low price point, it’s understandable why the Fire TV Stick and newest Fire tablet are so popular.

This finding also shines a light on the competition amongst similar Amazon products. Two notably unpopular products, the Fire TV and Fire HD 10, face competition from budget-friendly alternatives. The Fire TV is over twice as expensive as the Fire TV Stick and offers similar functionality. The Fire HD 10 is an earlier and slightly larger version of the Fire HD 8, but costs almost triple. When faced with a choice, Amazon customers seem to be willing give up some product features in exchange for a break in cost.

These days, it seems consumers will do just about anything to get their hands on the latest and greatest gadget. As Amazon streamlines the waiting process with the click of a button and ease of home delivery, it’s no surprise that they will soon surpass Best Buy as the top seller of consumer electronics.

In our analysis, our assumption is that product reviews matter. They are also one of many defining factors in whether a new product flourishes or flops. By comparing the number of days since a product launch and reviews in the first 90 days, we can assess if our assumption is true.

Datafiniti used its Product Data to analyze 1,000,000 reviews for Amazon products and determine the number for each product in the first 90 days after the launch compared to the days available for sale.

The overarching trend is not as evident in price, but there is some correlation between new products and an increase in reviews. We conclude that as more consumers turn to Amazon to find and purchase products, sales of their branded devices will continue to grow. If their press release from earlier this month is any indication, Amazon seems to be doing just fine. In North America alone, the e-commerce giant reported a 29% growth from 2015 to 2016 in electronics and other general merchandise sales.

Still, not all new Amazon products are an automatic success. Most notably, the Echo Tap’s performance was initially subpar relative to other Echo products. Until recently, Tap took away one of the most appealing features of the smart speaker brand, hands-free voice control. With the Echo or Dot, you can tell Alexa to complete a request, with Tap, you had to press a button first. Amazon has since issued an update that now enables a hands-free mode through the Alexa mobile app as long as you connect to WiFi.

For all the press that the Amazon Echo receives, our analysis reveals that it is the Fire TV Stick that’s exploding in popularity, as measured by number of reviews. So how does Amazon continue to infiltrate a near-saturated market? It starts with eliminating the competition, in this case, stop selling devices from Apple and Google. Combine this tactic with a cost-effective price tag, attractive features, and marketplace availability – and you have a winning formula for breakaway success.