I very much like my P99 (in .40 Auto and with an olive drab frame), and I pick up my second one later this month (in 9mm and also with an olive drab frame). The P99 decocker is completely snag-free, and as others have mentioned, decocking the P99 is not a task you'd need to perform under stress. It's something you'd perform between chambering a round and holstering the weapon. And, by the way, I can reach the decocker with my shooting thumb. I also find that I can manipulate the magazine release a tad easier using my shooting hand's index finger. JMC's comments about the trigger reset are spot-on. It's a keeper.
Waltere, it sounds like you should have bought a P99 (DA/SA) instead of the P990 (DA only).