Not practical for many sports - crashes

I am disappointed with this product because it has planted more than once, and it took losing my data to back up (the Polar assistance advice without explanations apparently not so rare to malfunction if you consult the forums).
Moreover, I was using this bracelet to track my indoor and outdoor activities with a polar H7, with follow on Polar Flow on my Android. The problem is that to separate sessions (different activities), disconnect the H7 in the chest, and there sometimes wait 10 minutes for the Flow Loop and find that it's another session.
Finally, I wanted to use Polar Beat for a kind of "coach" personalized. But in this case, the Beat activities are not related to those of the Loop, and despite intense activity shows only the Loop Flow activities and does not take into account Beat.
In short, technical malfunction, loss of data and lack of coherent integration between devices and Polar learned, although all of the same company, too bad. I separated the loop.
I bought a watch LG G Watch R and I always use my Polar H7 associated with Endomondo, and here everything works perfect sync with the watch, phone, website. And no crashes reported.