I’ve got the one without 3G web access, so I can’t really speak about that; but it’s a darn convenient book reader. This Kindle is easier to read than I thought that it was going to be, holds a battery charge for a long time, doesn’t have problems with sunlight that I’ve noticed, and is easy to carry around. So far, I’ve been using it to pick up various collections of pulp and Golden Age SF/fantasy books on the cheap: mostly books that I’ve read before, but either don’t have anymore, or don’t quite know where they are at the moment. It’s easier to read while doing something else than a regular book is; no pages to randomly turn on their own. Also: as a bathroom reader it’s pretty much ideal.
Lastly, speaking as someone who is left-handed I very much appreciate that they set up the page-turning buttons the way that they did (top button on either side: backward; bottom button on either side: forward). That went a long way towards making the thing intuitive for me.
Bottom line? If you’ve got the cash for one this is a pretty sweet gadget; I imagine that I’m going to wish that I had the unlimited Internet access, so you should probably fork over extra for that. I expect that this will become a standard travel accessory for me.