I had an earlier model, and ditched it after I forgot to put it on one day, and realized I didn't care. Having to have it charge for a bunch each day, and it not really being designed for overnight wear (as I understand it) really hold it back.

I bought a Fitbit Charge on impulse at an airport for a couple of hundred bucks, and have worn it every day since. I think I prefer it because the battery seems to last forever, it's light-weight, and it's not doing any additional features (although I think it can) than taking my heart rate, counting my steps, and a silent alarm. Would love the EKG feature tho.