I only took it out for a quick spin around the field last night, whilst my Steak Pie was cooking
It feels very well put together - it doesn't rattle, squeak, creak or knock.
The M975 brakes are a little odd in that both calipers are for 160 rotors ( says so on the caliper itself
) and yet both sets of pads seem to sit quite far out on the rotors themselves. The IS mounts on the frame and fork are both standard 160 mounts and both rotors are 160s, so I'm a bit puzzled. Power-wise, it doesn't seem to make a blind bit of difference (this is my first experience with XTR discs and they're GOOOOOD!!!).
It almost looks as if I can get away with sticking 165 rotors on, but I won't. The calipers, mounts and rotors are obviously all the correct size so it must just be the way that the calipers are designed.
I don't think I'll use the granny ring enough to warrant the extra shifter, cable and chainring so I might just run it with the 32T chainring upfront once the Hope bashguard arrives. The chain is already nice and tight (the mech is at about 95% full stretch with the chain on middle ring/large sprocket) - so there shouldn't be any issues with it coming off.