You guys are, of course, aware that Armscor did this a while back, basically cloning the Glock and using an alum alloy frame? Then Sarsilmaz in Turkey has done the same with the SAR 9, though maybe not available in the US as yet.
Personally, I view this as just another option for the M&P, even while the Mod 2 - or correct me if it was the original M&P - dealt with the frame flexing issue with a steel insert embedded into the polymer.
In any event, saves me from starting the thread I'd considered. I'm what you might call an "old hand." I knew about Glocks from Shotgun News back in 1985, bought one of the very early HK USPs in 1994, but recently, figuring I had at least fired them all, and definitely being a "trigger snob," I gave the Mod 2 Compact in 9mm a go and was very surprised. And while I was on my way back to DA semi-autos and building a CZ 75 variant. It ain't going anywhere. But neither is the Mod 2C!