I had a Fitbit Zip for years and had pretty good luck with it. I just put it in my pants pocket and went on my way. Now I have a Fitbit One and it's a pain because it needs to be charged. It's supposed to notify me when it needs charging, but nope, rare to get that message. So I may go days without noticing that it's not working. I just like to see how many miles I walk in a day and don't need all those other functions. I don't need an electronic device to tell me I sleep poorly. I've had other brands and have had no luck with them. Actually, I'm pricing a new Zip because I prefer a battery instead of charging it (but almost $60.00, yikes!). I also use the Fitbit app on my phone and iPad and have had no problems with either.