I have a Tracer 275; a Carbine 275 is almost (but not quite) the same bike, but in carbon.
My Tracer 275 is built-up as an all day, all mountain bike, not as a play bike like Box's, e.g it has Revs, 2x10, and Dampfs on Arch Ex; rather than Pikes/Lyrics, 1x10 with device and 2ply tyres on Flows. It's 30lb.
When I first rode Box's test bike at BAB, I always knew it was going to be a fast, plush, and grippy descender. But what blew me away was how fast and tenacious a climber it is. I haven't changed my mind, although I still can't pin-down why.
I'm 5' 11" and bought a large frame, fitted with a 50mm stem and 760mm bars.