I've put approx. 1500 rounds through our P99, and I can say that it is hands down my favorite polymer semi-auto for range or home defense use (it's too big to carry concealed). It is just as accurate and reliable as our Glocks, Sigs, and H&K's. I also think it is a much nicer looking pistol than the other polymers out there, but of course this is purely a subjective opinion.
The hard part is finding one. BTW, you want the "AS" trigger, instead of the "QA" trigger. Not that the QA is bad as it isn't, but that the AS is a bit better in most people's opinions.