i still prefer paperbacks. there cheaper, and lighter, and easier to hold (they flex better). but i can't stand those tiny mass-market paperbacks. they're an awkward size to hold, that also means they don't usually stay open very well, and the text and text block are too small - if you ask me, mass-markets are an inferior product in general.
it's not very often i get a hardback book. unless it's a certain author or maybe some sort of special occasion book (for lack of a better word) - J.K. Rowling (and her other pen name Robert Galbraith) for example.
i think it's cool that we have e-books now. they're much more cost friendly, they don't use paper, and along with self publishing allows authors more control over their work and more of the sales profit, etc. but i just can't seem to make the switch. it's just a completely different reading experience i would rather turn pages and be able to view my collection on the shelf. my book cases are a thing of pride for me.