I prefer books too - especially the heavy ones that make a big thud when they're plunked down on the gaming table. :D Lack of shelving space however, pushed me to get a 10" tablet a couple of years ago and start buying PDFs. I now only buy the core rulebook for any RPG or miniatures games I run, so there's at least 1 copy on the table for the players. It was a big adjustment at 1st because I'm old school and started gaming in the 80s, but with time I became comfortable with it. I go out of my way now though to buy artwork or print out the better quality art in the PDFs, which I tack on to the back of my GM screen or hang on the wall, lest my players be deprived of the wonderful artistic talents of the game artists. ;)