I had a P3AT for awhile. Great gun, flawless operation, no problems at all with the function.
I currently use a P32 however. The P3AT's snappy recoil tended to damage my shooting hand when I'd put more than a couple of magazines through it. Yep, after 12-18 rounds I'd end up with temporary tremors. The rubber grip trick didn't help. Sure, shooting gloves would have resolved this, but I like to practice with what I shoot with; bare hands. I could not practice as much as I wanted to due to this. I opted for the P32 which doesn't give me the same issue regardless of rounds fired. Ballistics aren't bad on .32's like Sellier & Bellot.
NOTE: This is just my experience with it. I can shoot my larger and heavier framed .380's, 9mm's, and such with no problem, the P3AT and my hand were simply not compatible for extended shooting sessions.
Both my P3AT and P32 have been 100% reliable.
Jack