I bought 25 Orlites for use in BMs when I couldn't find ANY USGI mags. Thought that they'd wear out over time.
Had to thin the overinsertion ribs on every one with a dremel, about 5 minutes per magazine. The mags work fine and not one has worn out yet (I haven't even degreased the last ten yet). Same magazines work fine in a friend's Colt Sportster. Orlites don't drop free.
I'd use them for practice mags...but wouldn't feel too bad about using them for real, they've been entirely reliable thus far.