I used the CMC power +10 for approx two years. I started to have an issue with them sticking the firearm. While I was at a firearms school I had total failure twice. Under slide lock I reloaded a full magazine to have the mag stick in the gun.
Needless to say I went to Wilson Combat 10 round mags. They feel much thicker and better construction. Time will tell.
I just picked up a 10 round CMC to see how it runs in my guns; If it works, it'll be a spare carry magazine.
The pamphlet that the magazine came with states "When rapid/aggressive reloads are implemented with the pistol in the slide lock condition, the feed lips are the only features that absorb and retain the full weight and momentum of the stack of .45 ACP cartridges in the magazine. As an example, 10 rounds of .45 is 42.8% increase in the weight of the stack as compared to what the 1911 pistol and its original 7 round feed lips were designed to withstand. Multiple aggressive reloads are the most common cause of fatigue to a 1911 magazine and feed lips spreading open..."
It goes on, but you get the idea.
I'm not sure how much thicker metal you can use to make a 1911 magazine, both the exterior and interior dimensions are limited...