So far so good - Lancer Systems L7 Advanced Warfighter AR Rifle, .308 Winchester, 7.62x51mm NATO, 20 Round Rifle Magazine

Only have a couple hundred rounds through this, but it works great. PMags are the gold standard, but what separates the Lancer from the Magpul is the metal feed lips. They add a bit more sturdiness to the overall magazine. They seat well, no play once seated. The only con, if there was one, is they are pricier than your Magpuls, Hexmags, etc....