Just shot it today. Put about 50 rounds through. Never a hiccup. Smooth as can be, no rattling, and best grouping I have ever done...
I got a stainless II a week or so ago.
To get break in started on it, I just racked the slide a bunch, broke it down, cleaned it spotless, re-oiled, racked it a bunch, broke it down, clean it, re-oil it... And so on.
After doing this for, oh around 6-7 cycles, the oil stopped having a dark tint to it and the gun feels like glass when racking the slide. Also put some very fine buffing compound on a felt patch, and buffed my feed ramp with my finger until I was happy, never let a dremel go near a new gun.
The kimber 7 round mag is nice, but I got a bunch of checkmate stainless hybrid 8 round magazines and like them a lot better. The magazine springs in those checkmates will shock you, I'd suggest letting them take set and loading/unloading them a few times before using them, because they might be a bit too stiff to feed properly until the spring sets.
Loading up hornady combat/target jacketed SWC 200gr in mine, over near-max charge of longshot with winchester primers, and this thing runs like BUTTER. That bullet, especially, is the smoothest feeding 45cal bullet I've ever encountered in my lifetime, it's FAR smoother than any JHP or regular ball ammo out there.
I'd suggest buying up some of the magazines I mentioned, doing some of the minor break in stuff I mentioned, then totally stripping the thing down part for part, degreasing/cleaning, and reassemble it with the best lube you can find. I'm partial to lucas full synthetic car oil. That way you know absolutely everything in the gun is "right." Might want to put an extremely light dot of blue loctite on the grip screw threads just as fore-sight.
If you're new to the 1911 world, round OAL/shape, magazines/magsprings, extractor tension, and internal springs are what you should keep an eye on and trouble shoot in that order if an issue ever arises.