My experience echoes others on here - screen burn cited when there was none detectable and appeal results in yet another not worth it price.
I asked for handset to be returned in case I needed a spare. But they didn't send back my samsung charger or the £40 RRP phone case I had it in. (I was happy to give the lot over for the trade in price quoted before items sent!) Apparently their written policy excludes return of anything but device. Wish I'd given the phone and all accessories to a charity or family member as everything in good working order!