I ride X.0 on all of MTB bikes. I was sick of having to adjust my deraileur all the time (xtr). The one to one shifting ratio of X.0 is more crisp and positive. I especially love the front derailer with grip shift so you can adjust trim. I personally do not like shimano rear deraileurs because they use 2 to 1 shift ratio. And the number one reason i like sram is because you don''t have the loud noise from you deraileur hitting your chain stay. The only thing shimano on my bikes are the xtr front deraileurs.