I used nothing but Power Mags, both 8s and 10s, for many years.
Never really had any issues with them that would cause me to look elsewhere, but every new mag is an "improvement" on what went before, right?
For my compact gun, I want as much spring as possible, so don't use any +1 mags, and do want parallel feedlips.
I like "hybrid" feedlips for my full-sized guns, but the compact would occasionally double-feed or stovepipe a live round with hybrids.
ACT-MAGs were my first foray into non-McCormicks, and while I like them a lot, they functioned great and looked good, I had them when tube cracking was rampant, all of mine cracked, so I went another direction.
If the cracking issue has been fixed, they should be good mags, though they do (did) have slightly tapered feedlips, and that might be an issue based on my experience.
I've used single stack mags from McCormick, Metalform, Mec-Gar, Checkmate, ACT-MAG, Wilson, and probably a couple of others.
All are good quality, but there are enough difference in the specs that you might love one that somebody else hates, and vice versa.
The mag that works for you is the best mag.