May 19, 2009
Shifts perfectly, every time
Rapid rise works well when shifting on an uphill, and/or under load
On a recent trip to Moab, two people in our group broke their Sram X-9 rear derailleurs, both on Slickrock Trail, both in the same part of the Sram's plastic body.
If you ride a lot, and have the money, get this model, if you're on a budget, get the cheaper XT.
The XT is heavier, and doesn't shift quite as well (I currently own both) but both models work as advertised, and are priced according to their respective features.
Either way, Shimano will get you there and back with minimal fuss.