Shimano XT has always been my number one choice for drivetrain and brakes. The value provided is the best in the industry and as the years go on, XTR technology always trickles down to the XT level.
The new M-8000 series cranks are no exception to the above statement. The cranks are plenty light and stiff and are easily mounted with their thru axle and pinch bolt design. It is worth noting to absolutely follow the torque specs for the pinch bolts printed on the non-drive side crank. Tighten the bolts in sequence, to assure even clamping force, make sure the plastic clip is seated and flush, and use a torque wrench to achieve the recommended setting. Ride your bike then check these again.
All in all these are a great crankset, packing performance and value in a sleek black package...About that black finish-
The black coating is wearing off very quickly due to shoe contact with the crank, leading to a polished surface beneath. This doesn't really bother me, but it can be a bit unsightly. A person could use one of the many aftermarket crank protection films on the market, or some clear 3M tape.