Their hardware and marketing are good, but software not so much - which is where magic happens. Completely agree that when it comes to software and user experience - Fitbit feels like a 'commodity'.
The 30% fall was mainly triggered by Fitbit revising revenue estimates for Q4 from 985M to somewhere around 725M as well as Q3 performing poorer than expected.
What's fascinating is that Fitbit is still going to do about 2.2B in revenue (up from 1.8B) last year. So annual revenue is going to be more than current market cap (1.7B).
Apart from a less than delightful user experience (resulting in device abandonment and low engagement/retention), Fitbit is also losing market share to Xiaomi in Asia.
So I wouldn't call it failing, but yeah it could do much better :)