Wilson warranties their work to run with high quality ball, Hornady Critical Duty/Defense, and their mags. They do not have the ability to test guns with Gold Dot or HST ammo, and I’ve not tried any Hornary ammo in it since I run either GD, HST, or Ranger only. Having said that, it seems to handle the 147 grain HST and 124 grain AE pretty well with a 14lb spring and no shock buffer as long as I use Wilson ETM mags. That is good enough for me. I suspect the bottom line is that 9mm 1911s are FAR more ammo, mag, and recoil spring sensitive than their 45 caliber cousins. That being said, they can be reliable enough for carry if you do your due diligence.
Finally, if you are looking at the CCU in 45, I strongly suggest that you give the Dan Wesson Specialist a look. Much better fit, finish, and customer support for $300-400 more. See my review of a 9mm Specialist in this sub-forum.