When you want your brakes to work in any condition or weather then go with the XT, or XTR by Shimano. I have used Avid, Hayes, Formula non of which have held a candle to these XTR brakes. Sure you can dial in the other brands, but sooner than later you will have them fade on long descents and and then comes the screaming. My XTR's are quiet and powerful. Just how they should be. After a entire summer of mtn biking I have no need to bleed anything, or any other type of repairs. I have been thrilled with these brakes. Never again will I run another brand of brakes. Coming from a guy on a SRAM drive train.