You just hit all my points with the exception of the mag commonality. And I'm in the same boat as far as waiting for reviews vs. early adoption. Especially with the nonsense of Oregon's M114 still up in the air, I worry that if I wait I *won't* be able to get it.
I've been looking into it more because of this thread, and it's really swaying me. It appears folded measurements would just about perfectly stow it in the get home ruck I keep in the 4Runner. For that use, I actually would want to mount an optic, even one of the cheap Primary Arms ones that I have laying around, and a cheap stowed sling.
I know there are plenty of better (but less foldy) PCCs out there, but I would just consider them as a house defense carbine, and I already have that covered with the more capable Canebrake.
I like the gen3 threaded barrel, which could take my Liberty Cosmic. I understand that the gen2 triggers are semi-atrocious (especially when compared to the S&W), but can be easily upgraded. I haven't seen anything on the gen3 trigger.
The S&W is likely a better gun for not a whole lot more money, but I don't own any other M&P products except for an AR, and wouldn't want a whole nother set of mags, especially for the "truck gun" thing, when I'm already carrying an extra 17 in my Tier1 for the carry pistol.