For only $10, you really can't beat this deal. I've bought a couple of these now in different colors and I haven't had any problems yet.
The hinges may be a little tight at first, but I would rather have them too tight than so loose that they're flapping around everywhere.
After wearing them a while, the hinges will loosen up. Either way, it's never been a problem for me.

If you're looking for a cheap pair of imitation Raybans, look no further.