The "M9" I bought for grandson #2 was as advertised, and even had a D spring fitted. Shoots wonderfully.
I also got lucky and caught Beretta with some .22 kits in stock. I'm impressed with that .22 kit... by far the best-executed .22 conversion kit I've ever seen; and it runs 100% with standard velocity ammunition. That's a first in my experience, as well.
However... the D spring was giving me light hits (failure to fire) with the .22 kit. No problems with the 9mm upper. I bought and installed a standard main spring; problem solved. Others have reported this issue as well... FYI.
My main "interest" these days is concealed carry, and the 92F doesn't work for me in that venue. But that .22 kit is a hoot to shoot, and I'm putting more time on it than those boys are.
What I would give for a genuine HK .22 conversion kit for a P30 or HK45C...