I have 3 of the ultra carry in the CDP, ECLIPSE--STAINLESS,, all three have went with out one problem--KIMBER has really tamed the recoil in a 3 inch gun with these little sweethearts. I do not recommend or use the factory mag in an alloy frame KIMBER. I change out the follower and spring for the Wilson or Tripp kits--and have never had a problem with them--the new KIM PRO mags work great and have become my carry mags--they will not damage an alloy frame. I have the ECLIPSE with the EE and have never had a problem with it the other two are IE.
The ULTRA CARRY IS A GOOD CHOICE BUT I REALLY LOVE THE PRO CARRY ALSO.
Luck with what you pick