I bought a MS Band 2 to replace a Basis B1 after Basis basically dropped support for the B1 the moment the Peak was announced, and also broke a number of promises, etc... I picked it because it had the best sensor package around, even including a UV sensor. I found it very useful. I also found it very flawed. My band was replaced FOUR times under warranty due to cracks in the non-replaceable band at where it met the device. Microsoft was very good about replacing it, but it just never really solved the problem, just bought me a few more months of use. The magnetic attached charger also had some issues, and the software has always been a little buggy...especially syncing with the app...which right now includes claiming the battery died and the clock reset basically every few hours. It was a brilliant sensor package hindered by lousy industrial design. When my band breaks again, which I'm sure it will, this means the end for my Band.