Ok while i am replacing my chain and sprockets i want to replace the top and bottom chain roller as well. I searched and could not really find any threads specifically about this. I am looking at tm designworks powerlips because i have had good results with their other products. Currently my bike has a cheap msr bottom that is worn out, and the top roller isnt much of a roller at all, it us a round piece of rubber that is bolted to the frame. It has a groove but no bearings, is that style stock? So, what do you guys that run the powerlips think in comparison to a moose or msr? Better by far? or maybe not worth the extra $10 a roller? Any input appreciated.