Seriously, Michael?
On rare occassions - and I do mean rare - I've had an issue with a transaction. But comparing this place to eBay, the experience is far more positive on here than I have ever had on eBay.
And I find it more common for someone to include a freebie or two on here, where on eBay pray if you even get the book you bought in the grade you were told, let alone something added as a surprise.
1) I've received an overgraded book on here a few times, but not often.
2) Sometimes I've had books sent in a soft envelope, graded or raw books. But when this has happened on rare occasions and books were damaged, sellers made it right.
3) Books missing from a large run - but the seller made it right and tracked down the books.