I just got my PAM 372. I thought I would get the one P series, but it is S series. There is no extra glass included since it's sapphire crystal. I wanted to try that plexi, but... I am kinda liking this piece a lot.
I haven't seen the plexi one compared to this side-by-side, but sapphire looks pretty good. I also noticed that the newer series has different OP number engraved on the case. It's OP 7029 (I think it used to start with 6). I first thought I was going to return to get P series, but I am sticking with this one.
By the way, I do not like ASSO strap that came with 372. I need to sell it. I prefer 26/26mm size strap than this tapered one.