I have 300 rounds through my GEN 3, never had a failure to feed or eject. Love mine, I've ran PMAGS, factory mags and pistol mags with out an issue. It's heavy and mine seems to throw brass 35', would be my only complaints. My 75 year old father has one as well, he loves his, shoots it every week, and has 100s if not thousands of rounds through his.
That said there are some real horror stories guys have had with them.