I've got a P99 in 9mm. Love it. Had some problems with jamming at first, but it was the ammo (I know that because while it fired from my Beretta, it jammed my friend's G17).
It comes with 3 backstraps to adjust the size of the grip, and 3 front sights of different heights so you can adjust the elevation. The rear sight is drift adjustable. It also comes with 2 10 round clips (yuck), but if you're lucky and wealthy enough you can buy some 16, count 'em, 16 round clips!
Shoots great, fairly accurate for a service pistol, feels great in the hand, small grip, no safety, decocker on the slide, nice trigger, etc. My biggest problem was finding a holster, because the gun hasn't been out for long. I found one from Desantis, but it seems that more are available now.