Oh boy, didn't know this would turn heated! Well I'm going to state my opinion on the original Nook, since that's what I have.
I love it. It's e-ink, like all the others said. It's got little to no glare in the sunlight, so you can comfortably read outside on a sunny day. You can buy new books, lend books to other people who have a Nook, and also connect your Nook to you local library so you can actually rent books for two weeks or so. I have yet to do that, but it will definitely come in handy!
I'm not sure about other versions of e-readers, but the original Nook can also change font size, text size, paragraph size, etc.... anything to make your reading experience more enjoyable. In order to turn a page or go to the next chapter, there are buttons on the side. You may also use your finger to swipe to the next page. Personally, I never had problems with fingerprints, because with the type of screen this Nook has, it's difficult to see it.
I would definitely recommend the original Nook!