I bought these books to help me start selling on Ebay. I found the books to be at best modestly helpful. The book contained what I felt as general information. Although if some one bought the book that had never worked on any sales sight I would beleive it to be helpful.
I love the variety of items available in an instant. I have had excellent luck as a buyer with finding good quality items, both new & used, at great prices even with the shipping. It's a good resource to know what is selling at what price, finding the odd and unusual, the out of print, and spare parts. The only downside I have found is that some try to make up the market value with extremely high shipping.