I've been looking at digital book providers for the past year or so. All the others had purchase packages that did not make sense for my needs. FlipBooklets was recommended to me by a coder friend, so I gave it try. Result: easy to use, excellent value for the cost, and fast customer service response when I was getting up and running. It usually takes a lot for me to take the time to leave this kind of review...but I definitely recommend FlipBooklets.