The overall quality of the fitbit (both as a band and a clip) is complete crap. My wife, hardly a heavy user of such, has had the clip die within two months, the band (a replacement) started acting up within about 3 months. Bought at two separate times from two different places. Friends have similar stories.
I haven't delved into wearables yet. I mostly have used my iPhone 5s (now 6) for the motion tracking, but it certainly doesn't catch everything (let alone doesn't catch vitals) since I don't carry it everywhere.
I haven't had any issues, but my wife's Fitbit battery wouldn't stay charged for more than 2 days, within a month of getting it. Since her replacement came in, we've had no issues.
My biggest complaint with the Fitbit is the lack of any battery meter on the device itself. Unless you sync frequently, you wouldn't know when your battery is running low.
I haven't delved into wearables yet. I mostly have used my iPhone 5s (now 6) for the motion tracking, but it certainly doesn't catch everything (let alone doesn't catch vitals) since I don't carry it everywhere.