We went electronic partly because I like gadgets and partly because we had so many books we were starting to get to the options point:
1) Move house.
2) Get rid of some books.
3) Put the books in the house and actually live in a tent in the garden.
4) Go electronic.

Nowadays, we're gradually coverting the paper novels to electronic; if I want to read one of our few remaining paper books, I scan it and check the OCR as I read. I tend to take the view that if you have an e-reader, it makes sense to convert over completely. It's a long job, though! :-)