Had a Nook, then upgraded to the Nook Color. Girlfriend has a Nook, and it's hard to pry her off it.
I enjoy my NC because of the ability to get magazines on it as well, in color. It's a great multi-use tool, from reading books, mags, playing a few games, web browsing, watching movies (kinda meh), or music.
I keep putting off purchasing a MicroSD card, but that'd really improve the capability of it. Battery life is pretty good- about a week or so on consistent use (1-2hrs/day) and low-to-moderate wifi use.
It is frustrating that publishers/authors are dragging their feet on moving to e-format. I'd really like to buy Jurassic Park (for the 3rd time) on my NC.
I just kinda realized that it's also better psychologically, becaus a big thick book isn't daunting on the e-reader. I'm almost 1/3rd of the way through the Game of Thrones 4-book set.