I had a no-show book and took too long to deal with it (I emailed the vendor multiple times, etc.), and missed out on the A-Z guarantee. Oops. Fortunately it was only $5. I always wondered what happened to the vendor. Great reviews for years, and then starting right around the time I purchased my book, tons of complaints from people saying that their books didn't arrive. It was like he dropped off the face of the Earth. I honestly wondered if he died or got very sick and didn't have anybody who knew to close his account, so people continued to buy books from him that never arrived.