Love the CDP
The first 1911 I ever shot was a Kimber Pro CDP that was a range rental. That particular gun shot so well that I fell in love with 1911's on the spot.
When I finally bought my first 1911 I shied away from the ones with the aluminum frame because I do like to shoot a lot.
Three weeks after buying my all steel Kimber I came across a Pro CDP II with internal extractor. This gun was new and unfired and since internals are hard to come by now a days from Kimber I bought it.
I do not regret my decision at all. The Pro CDP has been perfect from the beginning and I feel 100% confident in having it take the place of my Glock.
Do I wonder about my aluminum frame and wearing it out? Nope! What I do wonder about is how comfortable that light pistol is going to feel strapped to my hip as soon as my holster arrives from Lou Alessi.

When I go to the range and swap between my full sized steel kimber and the aluminum framed CDP I really notice the weight difference. I'm sure I could get used to carrying a 5" all steel 1911 with the proper set-up. It will be easier though to switch from a light Glock to a light 1911.
I've read too that Kimber will replace the aluminum frame free of charge if it cracks. Not sure if this is true but I'm hoping that it is if I ever need the frame repaired.
I do use Wilson Combat magazines but every one in a while a regular mag will slip in the grip when I'm switching between guns. The steel follower mags haven't scratched my frame yet but I try not to take chances.
Good luck with your choice.