I used them for the last 2 years, I bought them purely because they were cheap at the time and I think they look fantastic! There were a few niggles getting sorted out to put cheaper rings on because there’s no way I can afford the XTR rings! It was a bit of a hassle setting up and spacing with the bash guard but once you’ve done it once it’s OK.
Then, a couple of months ago they started coming loose all the time. It’s noticeable because there’s a knocking when you pedal and I always tightened them up straight away. When I had a proper look all the splines on the NDS crank were deformed. Not sure if this happened because they came loose or if they came loose because this happened. Chicken and egg. Once it’s happened though you can’t stop them coming loose so it was the bin for them.
To be fair, I ride my bike 5-6 full days a week, riding big mountains and a bit of DH, so it could be said that I’ve got pretty good life out of a light crankset.
In use they were good. I don’t really like the design for the bb preload which is fiddly and tends to come loose. Not sure if I’d say stiff, no difference that I could feel between that and XT. Got Saints on now and that’s stiff!