Is rebuy good?

I want to buy a New Nintendo 3DS xl soon. But no matter where you look, nothing under 600 euro. It's pretty tough. I took a look at Rebuy and it only costs 300 euro. I know the rebuy is serious and everything is, but the products are not supposed to be that good. Or the opinions are very divided. Now I just wanted to know who has already had experience with rebuy and what your verdict is.

You have a right of return and a guarantee, so I don't see the problem.