alpin knows what he is talking about as he has a number of bikes and sees it for himself.. the majority of people working in bike shops would agree.
shimano and sram both offer diffrent functions here and there at the higher end of the groupsets but shimano is a diffrent ball game when it comes to quality.
matt, you said you cant see shimano making anything to compete with xx.. the way i see it ,sram would have to go up another level of groupset above xx to equal the lifespan,the consistent function along with the qualities of xtr as it is.
i love the feel of new sram stuff compared to the stuff from the early days but its still got a lot of catching up to do with the real big S in other area`s besides how they work*.
*like how they work when nice and fresh and new and erm…non sloppy ;O)