They make good range mags, IF they're really in good shape.
I have bought six Orlites and have one specific problem that occurs. The front leg of the follower is short, like the old black followers, and as a result, when you get to round 27-29, you'll get a failure to feed. The base of the round doesn't get pushed up enough to be hit by the bolt coming forward. Its not a big deal if you're plinking, just annoying.
Another nit is that it doesn't work well with the LULA. Unloading is okay, but when loading I found you need to push the rounds in, because the plastic lips are thicker.
Don't ever buy them mail order. Besides the problems mentioned above, the upper section gets worn so that the inner steel mesh shows through, and the next thing you know, the feed lips crack. You need to be able to see this before you buy it. I bought four from AIM and one of them was worn like this; used it once or twice and the feed lip cracked... into the trash can.
If you can get GOOD ones for <$10, then fine, buy 'em & stick 'em in your range bag, and save your USGI's for when the baloon goes up.