Do not trust this organisation
My daughter bought a Mac book which was listed as in very good condition. But it never worked properly and quickly overheated. When it got stuck in a reboot loop we took it to Apple for support.
When they opened the MacBook they found that it didn't contain Apple parts, it had been spray painted to hide scratches and cables inside had been damaged making repair impossible.
Back market denied causing the damage in the Apple report and have refused to refund us saying we caused the damage. Do not trust this company.
This related to the German branch of the company