I must agree with Troy here. I would rather spend $25 or so on a good used USGI that getting 2 or three Orlites. The Orlites we are getting are worn out, and were never intended for longterm usage to begin with. They were to be disposable, and they are being disposed of in the USA.
The Thermolds are a big improvment over the Orlites, and are the only plastic mags I would spend my money on. There are at least in the same ballpark as USGI's. That being said, I would STILL rather have USGI's over the Thermolds.
As far as USGI's, I am not partial to any particular brand (though I like the Adventure Line name! Cool!), except to avoid Coopers. At least 20% of my mags are D.L.Sanchez, and no particular problems with those.
Even my worst looking USGI (pitted metal, apparently from new, on one side), functions perfectly.