I have a lot of technical manuals and other reading material which I refer to fairly frequently. A year or so ago I abandoned buying paper versions of them and instead bought PDF copies of the books. However I found that flicking between different application screens while working was more than a bit annoying and so made the decision to purchase an e-reader. I decided to buy a Sony PRS-650 as a person I work with had tested every available e-reader and had decided this model was the best.