I've been trying Safari for a while and I'm getting on with it quite well. While I obviously love the joy of owning physical books (over 60 O'Reilly ones...) they go out of date quite quickly and take up a lot of space. Never mind the cost of purchasing them in the first place.
So now I can pick and choose up to 20 books and permanently keep changing them depending on what I'm researching/working on. Cool eh?
(PS. I have bought 5 computing books in the last month! Perhaps this will be the near-end of it though.)