Was in the kickstarter project and all i have to say about the fitness stuff is that its pretty gimmicky, but otherwise the mouse is awesome as hell, not sure if there are any other mice with the same sensor at this price, but if you like the shape of the mice and use a palm grip I'd recommend this.
This mouse has been my daily driver for about 3 months now. Earlier mouse was mionix naos 8200 (laser one).