I ordered a large manual on Windows XP from the seller -- abookarama. Abookarama shipped me a large book, but NOT the one I ordered, not even close in subject matter. I then sent FOUR e-mails to the seller (through Amazon) asking them to send the correct book. I got zero replies from the seller, just silence. Not a good way to run a business. Then I finally turned to Amazon, who refunded my credit card, quickly and impressively.