I haven't been using the Lancer mags very long, but have had zero issues with them (only used the 30 round ones so far though). I like the idea of the metal feed lips, but I have yet to have an issue with Magpul Pmags either. I keep Lancer mags in the truck, Pmags in the squad car, and a mix of both around the house. I have more Pmags because I've been buying them longer and they're cheaper, but Lancers aren't that much more expensive. Long story short, I buy and use them both.