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Only a few rides in on my GX so can't comment on longevity but I like it so far.
Coming from XT 11spd (and XT 10spd before it), it has a lighter but more positive lever action and shifts more quietly.
Smoothness seems about the same, as does speed of engagement.
Basically, I don't think you lose anything coming from previous generations of Shimano or SRAM (of an equivalent level) in terms of feel / refinement.
I’m assuming from that that the cable pull ratio on Shimano 12 speed the same as SRAM 12 speed?
Seems to be. But my only evidence for that is that it has worked well for the last few hundred miles. But then Scotroutes off here couldn't get it working, so it may be fussy about something else and I just got lucky.
I had an NX mech that decided to eject it's back plate and jockey wheels part way down a run in FoD, this also resulted in one of the chain links getting twisted about 45degrees out of true. That was after 5 months from new, about 550Km according to Strava.
I've replace it with a GX mech and just twisted the chain back expecting it to shift awfully but put up with it until a new chain arrived.....the old chain is still on because it all seems to be perfectly fine and laziness has won so far.
Not overly impressed with the NX falling apart BUT, it is all held together by bolts/allen key fittings, so perhaps I should have checked it a little more often.
More of if it aint broke, dont fix it.
My shifting was out the other day until I noticed a fly has settled on the rear mech.