The quality of the books themselves is okay. They're used books. One came from a library the others just seemed pretty old but perfectly readable, no pages falling out, markings, etc.
However, the shipping did take an extremely long time, even for my country where the postal service is notoriously slow - approaching two months. Also the lack of a tracking number made me feel very lost and insecure as an obsessive checker. So good price, but if you were looking for something for the weekend or on a whim I might recommend another service.