I adore my Kindle. I have an old school one so really all it is good for is reading. It fits easily in my purse, you don't need an internet connection, books download in seconds and the battery lasts an incredibly long time if you turn the 3G off in between downloads.
If you like to read, it's way more convenient than reading off a laptop. IMO.
I read 2-3 books a week so well worth it to me.