Attempted to sell Champions League tickets on this site. Transaction was done. Tickets delivered. But on evening of the match, I received an email from them stating that the buyer had the tickets confiscated when attempting to enter the stadium. There was no real proof provided. Friends attending the match saw people sitting in the seats. I did not find their explanation or follow up to be satisfactory, and their communication patchy.
As far as I see it, these guys are criminal, and I would not try to sell anything, or even buy anything on this website. It's a complete scam. They resell your tickets but will not pay you for them.