I've generally had good luck with ProMags for a S&W 669, for several CZs, and for a Beretta or two. But springs tend to be weak and die young. And some ProMags for other guns have been nightmares for their owners.
Also had some, once, for a SIG P-210-6, when I wasn't prepared to spend $80 a mag for 8-round factory mags. After a LOT of work, reshaping followers, they did alright -- not factory, but OK for the range.
If you want to try them, and have problems, be prepared to deal with PRoMag directly, to get ones that work. (I've never had to do that, but know of others who have.) ProMag will send you new ones, and often extra stuff, too.
They're a crap shoot, but they'll work for SOME guns.