My Pro CDP II is a little over 6 years old. I found it didn't like my father-in-law's reloads. Using lead bullets, there was a noticeable lip/step from the bullet to the case. That's the only time it's hiccuped on me.
The gun is my daily carry weapon. I bet my life on it.
I shot my friend's Ultra CDP but it was more finicky. I had to make sure my grip was rock solid or it would FTE or FTF. My friend had a lot more problems than I did. He had a failure every 2-4 shots. I took the gun and emptied 4 full magazines at a steady cadence without a single hiccup. Let him shoot agian...failure. I then shot another mag and got a failure. I attributed the failures to, his lack of practice and limp wristing...my hands being fatigued a little from the previous 4 mags. I didn't have another failure after that as I made a conscious effort to get a solid grip.
I have heard the with the improvements to the dual captured recoil springs, a lot of the shortcomings of the short Ultra's have been addressed. Have not shot one of the newest ones though.
I have another bud who is a huge 1911 guy. He shot my Pro CDP and was really wowed by it. It really shoots tight groups. He found a nice used Kimber up in his state. Got it home and was bummed that it shot well but not as well as mine. Asked if I wanted to trade...
NOT!