Bought a Kimber Compact CDP a month ago. Have not shot it enough yet to be totally familiar with it. Had it to the range four times.
I was suprised to find that it does not have a lot of muzzle flip. It's my third 1911, and shoots pretty much like the full size Springfield I have, which is a lot heavier. It groups better than the Springfield too, although I need to drift the rear sight a little.
The only problem I have experienced with it is the fact that it will occasionally lock open prematurely. That is not acceptable on a thousand dollar gun purchased for carry purposes.
It has that funky plastic mainspring housing. I figure replacing that is about the only thing I can do to "upgrade" the gun and make it a little more mine.
I haven't decided yet whether or not I like the aluminum frame. It makes for a light, comfortable to use pistol. It does not seem possible to polish the feed ramp, and I wonder how it will hold up to the abuse of hollw points slamming into the feed ramp. I have to remember to take off my wedding band when I shoot it. That is to avoid wearing the finish off (and the aluminum) where my ring contacts the grip. Learned this the hard way with my SIG P229.
I looked at a Compact Stainless, But it was lacking night sights and an ambi-safety. And the CDP just looks cool.
I have not shot the Ultra CDP. I wanted a four inch barrel for several reasons.
There are other manufacturers making nice compact 1911s. Springfield cvomes to mind. I wanted a Kimber this time around. I don't have experience with similar compacts, so I can't give you any suggestions regarding one brand or model over another. Just my opinion of one model with less than 300 rounds through it.