I've got some of the first-gens and haven't had problems with them, although my Aero Precision lower has a magwell that's a bit too tight to fit PMags, so you have to tap it in pretty firmly to make sure it seats properly.
As for the follower and feeding issues, that's one of the primary benefits of the PMag vs. every other mag that I know of. The PMag has a constant internal radius from top to bottom, so the follower (and the loaded rounds, for that matter) never hits the "kink" in standard-style mags where it transitions from straight to curved. It's smooth sailing through the whole mag. The internal geometry is different from the external geometry, which is one thing I don't think they ever could have accomplished with a metal mag. This is also one of the benefits of standard aluminum 20-round mags; they are straight, so they don't have the transition area. The original AR mags were 20 rounds, and the 30-round mags came later and added a little drop in the platform's reliability. There have since been multiple redesigns of the standard follower to fix this problem. The PMag does an end-run by eliminating the problem where it starts, in the magazine body itself. Of course the PMag follower has some anti-tilt refinements as well, because the "kink" isn't the only place where followers can have problems, but of course it's tuned to the PMag's other refinements. Overall the entire PMag is very well-engineered as a more reliable system than standard mags.