I'm NOT a Pro-Mag fan but...
I've had good success with SOME specific types of Pro-Mag magazines, and horrible experience with others.
Back during the Clinton hi-cap mag/assault weapons ban, a period during which CZ first introduced the compact-sized CZs, the Pro-Mag 10-rond magazines for the CZ-75B Compact in .40 (a gun that CZ never introduced, but had planned to sell).
When CZ later introduced .40 versions of those compact models, they had a bad time getting those magazines to work properly. The Pro-Mags 10-round .40 compact mags were a fall-back position. I don't think Pro-Mag makes them any more.
I picked up a couple of those mags and found that they worked perfectly with 9mm rounds, and held 14 rounds! A bunch of us on the CZ Forum at the time scarfed them up. (This was accelerated when we got a letter ruling from the ATF that said that using .40 mags loaded with 9mm round was a legal practice, as the mags were legal as purchased, nothing had been modified.)
I've also had them work well in Berettas and in guns that used the S&W Model 10 mags. But full-size CZ mags were always a disappointment. The problem was generally crappy springs, and unless you could buy a Pro-Mag for a lot less than a Mec-Gar or CZ factory mag, the cost of getting them to run right was prohibitive.
For non-1911s, I always go the Mec-Gar route -- if only because that for a number of years Mec-Gar made mags for most CZ models. (I don't know who CZ uses now for their different models, but think they make SOME mags for some models themselves, but outsource production for other models, selling them as OEM mags.)
I once bought some CZ Factory (full-size) magazines from CDNN, and when I opened the packages they were absolutely correct 10-rounders. I was surprised to find that markings on the back of the identifying paper insert showed that they had been made by Pro-Mag.
Pro-Mag can make good quality magazines that function as they should, at least when making them to gun-maker's specs, but they don't always do it with stuff that carries their own brand markings.