I built up a new bike with the M8000 drivetrain literally a few days before the snow blanketed the trails in Utah. I got a few rides in then, and have been able to make a few winter trips down south for some more riding. I don't have a full season of riding on this stuff, but I have enough miles to know that Shimano has taken it's XT performance, reliability, and durability and added an 11th gear. Smooth shifts, durable parts, and a smaller price tag then XTR or the SRAM 1x11 drivetrains (X0 and XX) make this an obvious choice to make your rig go to 11. Plus no XD driver! I have had 0 shift issues since I've been running the XT setup. Shimano kept the pricetag down here with a steel and aluminum mix on the cassette, small weight penalty, but added durability. I look forward to many more miles of frustration-free shifting.