Oswaldo R.wrote a review of Shimano XT M8000 Shifter Set - OE on October 18, 2015
Familiarity: I've used it once or twice and have initial impressions
I just purchased the new transmission set XT M8000 1x11. I was previously using an SLX/Deore hybrid 3x1 transmission. I saved 1 lbs with this new set up. The shifter is great, extremely lightweight, seems fragile but if you take care of it, it should be fine. The think I love the most of it is you can shift 3 softer (slower) gears with one press (make sure you press all the way through for this) and there is an option to shift 2 harder (faster) gears with one press as well. This is magnificent when the terrain changes suddenly and you need to respond quickly. It is the same mechanism as the XTR althoug I presume this should be a couple grams heavier, though not significant enough. The whole transmission looks pretty fancy, the looks on the shifter has been cared for so your bike will look pretty fancy once you set this up.
I've only used it a couple of times so I cannot talk about durability but so far I am pleased with this shifter, pretty smooth shifting, easy to press levers, lightweight, fancy-looking.
All in all I am a big Shimano fan for a few years now of XC Marathon racing and XT always delivers.