Seems that you have enough opinions but I'll add my 2 cents.
I have a Para and the two 8 round mags that came with it work like butter. I've a couple thousand rounds through these mags and no problems at all. My daughters man-meat had a S&W with stock Wilson mags and bought two more of the ETM mags and two McCormick mags and has had nothing but problems with the gun. Sent it to S&W, they determined that their gun was not the problem and did nothing...sent it back with two more Wilson mags and the problems persisted. Since he no longer trusted that gun, he got rid of it because Smith didn't want to fix whatever was wrong with the mags or the clunker of a gun he had....
All of the Wilson mags he bought work fine in my Para so for the time being, I have access to several new Wilson mags (great mags) as well as my stock Para mags. I don't know what to make of the these problems and I don't know if Para makes their own mags. It's obvious that S&W does not.
Best bet, try what ever comes with the particular gun you buy and if they work, don't try and fix what ain't broke.....Don't fall into what I call the "fishing lure" syndrome where most fishing lures sold are meant to catch the fisherman and not the fish!