My previous XC bike was full Shimano, XTR everything but hubs (Ringle front and XT rear). That was before Sram's time tho. The current one's a mixed bag, Sram shifters and rear mech, Shimano front mech, Raceface cranks & chainrings, Shimano rear casette, mavic hubs & avid juicey brakes.
The Sram rear mech shifts better under power than I remember the XTR did, but then again, I'm comparing a 15 yr old XTR to a year old X0, so it's not entirely a fair comparison.
I still prefer the Shimano style shifters, but see the practicality of Srams being thumb operated only. Perhaps I'll prefer the Srams after getting used to them. Time will tell.

