I've handled and fired several of them, from an early production SW1911 to the more recent DK.
Overall, nice pistols.
I finally elected to buy a SW1911Sc 5". Yes, the lightweight frame has some increased felt recoil. I discovered that when I bought a lightweight Commander back in the early 70's. Nothing's changed, it seems.
The steel pistols are pretty controllable, and make for nice range guns, but I own 4 other steel 1911's of various sizes, and bought the SW1911Sc for lightweight carry.
I saw a couple of our guys have a couple of failures-to-close-into-battery one day when we were test-firing a SW1911PD 4.25" pistol. When I checked the pistol it was pretty damned dry, and not a little dirty. When I locked my grip, though, it functioned fine for me with the same JHP ammunition. It could've used some lube, though.
There was indeed a reported cracking issue with some of the ACT magazine lips, according to what I was told by a vendor. Interestly enough, I was also told that it was supposedly noticed with blued magazines instead of the nickeled magazines. The several blued magazines I've seen in use, and own, haven't exhibited any apparent issues thus far. I'll be conducting some long term testing of some, though, just to see. It's not like this hasn't happened to some other magazines, however.
I'm not worried about it with S&W's customer service and warranty, though.
My SW1911Sc exhibited similar (excellent) accuracy when compared to my XSE. Functioning has been excellent with various loads.
I'm beginning to suspect the SW1911 series is becoming one of the best out-of-the-box 1911's available, and at a decent price. The reliability of the S&W external extractor doesn't hurt, either.