I have this PAM422 "O" from SF Factory. This is the "best" version available at the moment, a really nice watch. The case is the same "thin" case as PAM372. I went with the sapphire version as per gen. The sapphire shape looks good, a high dome sapphire without any kind of distortion.
I love it, one of my favorite PAM's (even rep & gen).
But it has some "important" flaws, like the engraving on the dial (first version was just a printed dial) which is too white, not creamy as per gen. The lume seems also a bit more greenish than gen... Movement is also wrong, with a faux PR indicator (like PAM346).
Personnally, even if I'm a bit anal, I really love and enjoy to wear this PAM422.
Evora