kindle and nooks are the first technology I have heard of that make me feel old. I prefer the hard copy. can loan it out,dont have to worry about future format compatibility,etc. if i buy a book,I want to be able to keep for re-reading if I want.
get off my lawn.
You do keep the book or re-reading forever. Plus, you don't have to worry about losing it or moving it or storing it etc. 
Also, you can lend books to other people for 14 days if the publisher allows it. Another great feature is the kindle app on your phone. I can pop open a book I was reading on my phone if I want and it opens to wherever I left off on my kindle (and vice versa). Pretty great.
I don't keep much. I have a small two-shelfer that isn't even full. The rest I give away. My fam reads a lot. Books get passed around like KU BB team managers. I will use the crap out of one, then never see it again for two years while everyone else has their way with it.
Also, I am skeptical of the screen. I work on a high res monitor all day and my eyes hate me at the end of the day. I have heard that the kindle screen is completely diff, but feel like I may be giving my eyes a kitn if I read on a screen at night .
Final, and possibly biggest concern: I read in the bathroom a lot. Worried about electronics in the bathroom.
