On the one had you get to carry around a whole library where ever you go. There have been many occasions where I was made to wait and I didn't have a book with me. This was the selling feature.
But on the other I am a huge book nerd. I love the way books feel in my hands, I like the way the spine looks on a new book and how sometimes books keep that new-spine look even after multiple readings. I love meeting authors and getting books signed. I have almost three shelves filled with author-signed books. You can't get an e-copy signed.
But I broke down and got one. It came in this week and so far I am enjoying it. Because I have to be different and don't want just a plain ol' white one, I have a decal coming. There are so many cute decals on there it was hard to choose. I narrowed it down to the library & the book tree.
I have been on Barnes & Noble's site downloading free & cheap books. I will only download legal copies (read this if you are are thinking about downloading illegal copies of someone's books. Please don't). There is also a a website called READS where you can check out digital copies onto your e-reader for two weeks from the library system from your home (you can also borrow audiobook files).
I probably won't have the popular books on my nook, but that's ok. I will buy a physical copy. I can't spend $10 on a digital copy of a book when there are so many books my students at school want to read. I live in a fairly poor area. There are no bookstores around here unless you count Wal-Mart (and while I am glad WM carries books, they don't have a huge selection). Also, the county library is sorely lacking in the Young Adult section. So I feel like I am providing a service to the kids around here. And I like buying books. It's an addiction.
If you're thinking about buying an e-reader, weigh your options & check out the options on each.