I have been using Wilson 47-T's for years for USPSA. I have had two issues with them. On one, the tab on the front (stops over insertion) broke off. I sent it back to Wilson and they replaced the mag, no problem.
The other issue is the followers. When the mags were new, they worked fine in all my 1911's. Then during a match (an area match, of course), the follower would slip past the slide stop and push the slide stop partially out. But only on my Colt. After about another year, this would happen on all my 1911's. I bought replacement followers and springs from Wilson, and my Kimber worked OK, but not the Colt. About 6 months later, the Kimber would not work with the new followers either.
Is it possible that the nylon followers shrink/change shape over time??
I finally bought the hybrid followers that Tripp Research sells. They fit perfectly, and I haven't had a problem since.
I have NEVER had any feed issues with the Wilsons.