I shoot a lot with CMC's, but have had to replace springs, but even with replacing the springs they are a great value. The CMC powermags have all been great.
After a few thousand rounds, every Wilson I've ever owned needed the springs replaced. I also have a Springer that chokes on them.
The first gen Tripps were terrible, and I'm still so peeved I haven't tried the second gen yets.
Metalforms and Colts are great in the 7rd option, but I prefer an 8rd.
I've found the only 8rd magazines that universally work in every 1911 I own and hold up to thousands of rounds without any issues whatsoever are the Checkmates.
If you're a 1911 fan, and you haven't tried one of the Checkmates yet, you really owe it to yourself to give them a try. They are pretty darn impressive.