Have had mine for about two months and it was my first moon clip gun. Was not too sure about using moon clips but the 929 is a fantastic firearm! Accurate, nice trigger and not everyone has one. Liked it, and moon clips, so much that I went and got a 625, .45 that uses moon clips also. It is a handful and dead accurate too.
The only issue with the 929, and it is a small thing, carbon build-up on the muzzle under the compensator can be a bit of a bear to clean off. I did not take the comp off for a bit over 300 rounds and was surprised by the baked on crud. Got it cleaned up and now clean it after each range outing.