I was first so impressed when I saw The O'Reilly Guarantee( http://shop.oreilly.com/category/customer-service/oreilly-guarantee.do http://shop.oreilly.com/categ

I was first so impressed when I saw The O'Reilly Guarantee( http://shop.oreilly.com/category/customer-service/oreilly-guarantee.do http://shop.oreilly.com/category/customer-service/oreilly-gu...), they will give you a full refund for any reason and any time. They trust their reader and will not suppose them speed readers, while Kindle library will not do the same thing.