This definitely piques my interest. I like the idea of adding a steel frame to a striker-fired pistol--I'm sure it shoots freakin great. I get the impression the P99/PPQ family of guns are kinda "sleepers" in terms of their accuracy and shootability--I was definitely surprised (pleasantly) by the P99c I shot a while back. To me, it was in another league compared to most other striker fired guns. But I will say it was pretty snappy... certainly 40 oz of steel would fix that. Plus, I'm sure the grips/texture are far superior to bare plastic.
Only thing...
The PPQ trigger is just too light for me without a safety. It's a sweet trigger. But it feels like a straight-up single action to me. At least the one I tried did. I kinda wish they'd introduce the steel frame with the P99 system (ie, decocker). But I'm fairly certain that'll never happen. Neither will a safety. So... probably not gonna be for me. But I like it. And I like the idea.