I agree with the above posts--I have SRAM, Shimano, and Campy pieces, in XT, XTR, and DA (nothing in DA 8spd), and have had no issues, EXCEPT as HillRider pointed out, my brifters would not reliably shift the XT FD, so I went to DA 9spd bar ends with Tektro brake levers. That solved my only 'issue' with "mix-n-match".