I cant for the life of me think why GX isnt acceptable, other than youd like something more blingy. I'm willing to put a 6 pack on the fact, that in a blind test, you couldnt tell the difference between a GX rear mech, and an either higher priced equivalent. Ill supply the bike, and beer, and put you to the test on it if youre willing. As noted in earlier posts, you can get current gen, cable XX1 groupsets on TBS bike parts for mere shillings. If you need it, go get it, otherwise, I'm unsure about complaining about...