I made one mistake, and bought one of their first generation trackers. That device was difficult to use and software was terrible in UX department. I dropped it to garbage can, after a while, due to small added value to my life versus lots of time and effort invested in usage.
Then I have repeated mistake, this counts as stupidity, and bought one of later generation devices. That was working better, but difficult to use, software was better but with some inexplicable tendencies etc. So it was a mixed performance product. Later on device started to generate obviously incorrect data, which turned out to be a software problem, that can only be solved by erasing 1+ years worth data from their online only database. The clip on the device, which was problematic to begin with has broken, with no feasible customer service option available etc.
So it is a very nicely designed piece of garbage.