Well, after a muddy ride in the Surrey Hills, I can report the new XTR drivetrain works, and works really well.
The good points:
– shifting is very precise, the upshift in particular. My 10 speed XTR often double shifted up, which was a tad annoying, not the case with new XTR
– The drivetrain is almost silent
– Stood up well to mud and grit, despite me running summer lube (squirt)
The bad point:
– The clutch lever is a pain and will break very soon
Im happy with some extra range as my 1×36 in the winter was hard going.