I've had mine since the release. I have tried the alternatives but they all have issues.
- The Fitbit Charge models have MAJOR issues with display scratching, and CS is very poor. Also the auto sleeep detection is not stable
- Most other brands cannot be used with Windows Phone.
- All of the brands have issues on accuracy reported on their user forums.
- Heart Rate detection on all are still in the early stages of implementation and vary widely
- The clasp on many is problematic, and the bands fall off undetected and are lost.
Since these devices ( and I've tried many, researched all ) are in their early stages of development, rather than invest in others, I'll stick with the band for now and see what the future brings. The biggest downside I hear about the Band is "comfort" yet I have absolutely no issue with it. I haven't worn anything on my wrist for many years ( though I have a nice collection of watches ) but I acclimated to this quickly and it really works out fine.