the diff between higher end and low end deraillers performance wise is rediculous...im not donw grading thats for sure!

I tune my bike which is full XT every 8-10 rides or so and it shifts incredible...I tune my ol ladies bike which is all deore...every ride and she complains about 8 miles in about out of tune deraillers.

I tune both bikes the exact same way so the only variables are riders and component level...I will probably be riding her bike tonite since mine probably wont be fixed and that will narrow it down to 1 variable...component level and I guarantee thats why they come out of tune.