This shifter has cut the amount of time I need to put towards adjusting my drive train sustantially. This is another one of thoese produts where you put it on and just stop worrying about it. Unlike many other derailleurs on the market these days. The shifting is smooth, if you don't want to pay for the Sram X.O. but still want great perfomance with a 1:1 pull ratio this is the derailleur for you.
So far I have nothing to compain about with this derailleur.
If you don't want to go with SRAM check into a Shimano Xt product and you should expect the same quality.