I'm guessing you can only return these if they are defective, but I figured I'd check. I would like to try out the Collins version, but ordering sunglasses online is such a crapshoot. If I can return them if they look terrible on me (always a very good chance), then I'll join. Otherwise I guess I'll have to pass.
Knut$30 means different things to different people. I'm a broke college student so I'm in the same boat as OP, not willing to buy if returns are only limited to defective units.