I got a 940 and it has been 10/10 so far. for ammo, it seems to get along with 1-1/8 oz loads at 1200 FPS or higher.
If you try to run the super light 7/8 oz stuff right out of the box, you might get some stubborn cycles.
try to spend your first afternoon at the range with some 3 inch magnums just to let the parts marry up. After that, it should eat almost anything