I have a P99AS and loved it enough to also pick up a PPQ; essentially the same gun with a few minor differences.
Neither has a safety, but the P99 does have a decocker; you can still fire it in DA mode, but the extended trigger pull will mitigate against accidental discharges.
The PPQ does NOT have the decocker; it is locked, cocked, and ready to fire.
Ergos are fan-freakin'-tastic for my hand, and both the P99 and PPQ are closest I've come to finding natural "point-shooters" (the XD's are a close second). I can consistently blow the 10-ring out of man-silhouette targets at 10m.
Not every gun is for anyone, so if at all possible, I always recommend "try-before-you-buy." But I doubt that you'd be disappointed.
Aftermarket support has been provided by Smith & Wesson (as Walther's U.S. distributor), but Walther is soon opening their own U.S. support center (yay!).