No specific experience but used computers, especially laptops, are one of the most heavily scammed areas on eBay. Buyer double beware, and seller, too. Do your "due dilligence" before transacting business.
I had 2 issues sellign my Ferrari on eBay first buyer used BIN and wanted it sjipped to her husband in nigeria shortly after member was no longer registered. Second buyer bought it with BIN and paid but wanted it shipped to a friends which I refused. Finally sold it to a ligit buyer that is happy with it.