In my recent review of the Lancer L5 Advanced Warfighter Magazine, I mentioned that I did not get a chance to shoot with these mags yet, but had high hopes for them. Last weekend my hopes were affirmed after I shot a 3-gun match at a local club, and they performed admirably. Inserting the magazine was effortless, even with a full mag on a closed bolt, while wearing gloves, because of the aggressive texture on the magazine body. I had no magazine-related malfunctions at all, and the mags were dropped into clay dirt and rocks quite a bit.
One time I dropped a mag prematurely onto a particularly dusty patch of ground, due to a case with a blown primer sticking in the chamber. The manufacturer apparently missed drilling a flash hole in that particluar case. (Whoops!) After clearing the errant case, I grabbed the nearly full magazine off the ground and put it right back into my rifle, and it continued to work flawlessly. I would not hesitate to recommend these to any competition shooter, and did so many times over the course of the day.