This has me interested in the Sram XX1 11sp drivetrain, but its expensive... £700 for cassette, shifter, derailleur, cranks and chain!...very nice though...much better looking than the XTR 11sp stuff.
Lightweight and quiet. Amazing drivetrain. Yeah, it's definitely pricey, but well worth it. I have the X01 kit on my Nomad, which works just as nice for a bit less.