Yes, tons of competitive products have great reviews. Perhaps you should do some research. You haven't even read my posts here or Googled "activity trackers." Reviews don't mean much because each tracker model is unique and feature sets are still evolving. Basic, inexpensive trackers should work for 98% of buyers. It's a little like researching "the best car."
In a previous post I said:
"Wikipedia lists about 20 makers of "activity trackers" including Garmin, Jawbone (a big player), LG, Nike, Samsung, Sony, and Microsoft. FIT has powerful competitors." And that list doesn't include Apple.
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