I'd pay $50 for one no problem.
They're basically a copy of the Marui design (like they pretty much ALL are...), and can handle upgrades and add-on parts as well.
Obviously, the more you pay, the higher quality you get.
UTG's products in general have shown to give you a lot of "bang for the buck." Keep in mind you're not buying a Lambo. You're buying a Lambo kit car on a Fiero chassis.
They both look nice, and unless you get under the hood you really won't know the difference.
Russ
"Time has little to do with infinity and jelly doughnuts."