I have three of them.
One first gen full size, one current gen full size and one current gen compact.
Yes they are still in production.
Yes, it is a great hand gun.
Why hasn't it sold well in North America?
A combination of marketing, or lack thereof, and the fact that most shooters in this country will absolutely run from anything that is different to them.
Shooters here hate the paddle mag release, even though it is far superior to the old style button, they have been brainwashed that a DA/SA is no longer viable, and the Walthers suffer from NIH Syndrome (Not Invented Here).
Too bad, because they are missing out on one of the great pistols ever offered.
It's SA trigger pull is identical to that of the PPQ, which gets a lot of kudos as the best striker fired trigger out there.
Mine (all 3 of them) have digested everything I have fed them, the only issue I have had were with a couple rounds of out of spec Freedom Munitions reman stuff.
It's a great pistol.
My P99 AS current generation pistol.
It has Trijicon night sights that I installed, and currently serves as my HD pistol, stoked with 147gr. HSTs, in a 20 round Walther mag, and a 17 round PPQ M1 mag loaded the same, in reserve.
Oh, yeah, they have magazine commonality with the PPQ M1 (paddle release).