They work as slick as glass, and so far so good. While they don't feel indestructable, at this capacity, they seldom hit the ground, and when they do, it is falling like 4 feet. I haven't stepped on one yet, as I have never had to reload it. I think the additional round, lighter weight, and reduced cost make this a winner. I had one of the prototypes, and it has been in my bag and running with 48 in it from day one. I don't have it with me today, but I did one on a FDE Maglevel and numbered it on both sides. This is my go to mag above 28 rounds evey time.