Love em! Get one. But if you have a smartphone, don't bother getting the 3G one. Even if you don't have a smartphone, it's still not worth the $50 to get 3G imo. Buy all your books online and send em to your computer while you're home. If you have your smartphone you can turn your phone into a wireless access point and use that to go buy a new book if you need to. Or you can always find one of the billions of Starbucks with their free Wifis.
Kindle still can't replace a paper book sometimes but it's much easier to read when you can change the font sizes. Don't go Sony, don't go Nook, don't go Kobo. Go KINDLE!