I've been using 'em since they started stocking them. I've run them through multiple good quality AEGs and never had a problem. I've inspected them pretty closely compared with some high quality bbs I bought a while back and can't find a difference in performance or material quality. They way I see it, they're cheap, local and they work. I would recomend them. The only thing is, I generally don't like using black ammo cause it's harder to see, but that's just a personal prefference.