I just purchased the P99c .40 about a month ago after doing a lot of research (and with help from guys on this board). For that price and with the extra mags, that's a bargain. I bought mine for $570. Threw about 300 rounds so far, no problems whatsoever.
The only issues I have, well, not even issues, but things I would change if I could, would be the magazine release on the gun. It's ambidextrous and right by the trigger which I'm not too crazy about just for safety reasons.
The other is the plastic sights; I'm looking for nights sights now, preferably steel. With that said, I haven't had them fly off or anything, but don't want them too either.
The last is the decocking feature; it's a little awkward and unlike my service weapon(Beretta) when you decock the P99, you have to rack the slide 1/8" to put it back into firing mode. Whereas with the Beretta, the decocker is a lever; you just have to flick the lever to put it back to firing mode. I never carry it decocked for just that reason but.....
All said, it's a great gun so far, good looking, light weight, sad part is I'm more accurate at 25 yards with it then my service gun.