But I mean, how do you use it personally - like to read books during your commute on a bus or subway? Is the point of it more to be able to read books while you're on the go someplace, or do you use it mostly at home?
It's another of those gadgets that I'm kind of interested in, but wonder if the charm would wear off pretty soon. Carrying a paperback book around never seemed like a big problem to me, but it might be cool to have a library of a lot of books available whenever I want, instead of just whatever was light enough to carry.
Not to hijack, but I've got a Kindle (that I've had for about a year and a half now), so I can answer these questions for myself:
I use my Kindle (basically the same as the nook, very slightly different design) for reading a
lot on the bus and anywhere else I'd normally read a book (at home, in bed, in a park, etc). I read easily 5-10x more books with it than I did before I got it, too.
I've had mine for about a year and a half, and the charm certainly hasn't worn off for me - I take mine almost everywhere with me, and it's probably the second most used electronic in my life, after my computers (well, maybe my phone, but only because I use that for music). As you mentioned, one of the biggest appeals is that I can just download or buy every book I want to read, and then wherever I go, I have them all with me, so there's never any chance of finishing a book and thinking "Well, crap. Now that's gone, and I'm out of books." I also occasionally start reading a book that's interesting but a bit heavy, and since it always saves the page you were on (ie no dog-ears or bookmarks to get unfolded or fall out), it's easy to jump back and forth between several books at the same time, depending on what you're in the mood to read.
The best way to tell whether you'd like it or not is to go on Amazon or B&N, and look up the past 5 books you read. If every single one is available in ebook format, then you'll probably love it. 3 or less, and you're more likely to be frustrated by your lack of reading options. None, and you'd hate it, lol.
For anyone who claims that they prefer to read a real book and think they wouldn't like reading on a nook/Kindle, if I have the time, I try and sit them down with a book they'd like, and have them read a chapter or two on mine. Usually, they're convinced at the least that they certainly wouldn't dislike it (though some still say they'd prefer the actual paper books themselves, more for the feel/smell than anything else). I also like the fact that it's light enough to hold and use entirely with one hand (ie you don't need a second hand to hold up the book, hold open a page or turn a page).