Sold me a book that was not as described, and refused to pay for return postage when I asked to return it.
Item description stated that the book was "not marred by notes", but it did have some writing in it. I wanted to return due to this with the intention of getting another copy. They refused to pay return postage even though they were the ones at fault.
As I bought it from them through Amazon's Marketplace, I am currently in the process of trying to get Amazon to step in.
I'm sure they are great if all goes right, but it is how they deal with things when they go wrong that really defines a company, and on that basis this company has completely failed. I certainly won't be using them again.