Well I'm anti kindle. Haha. Both my inlaws have one. The reason I don't like it is b/c it doesn't support ePub format. So if you wanted to rent books from your local library or other sites online they will most likely be in ePub and you can't do that on the Kindle. It also ahs no expandable memory. No SD card. So you can only hold what it handles. I love that I can put books on an SD card and have more.
I personally am thinking of the Nook b/c it does support ePub, it has Wi-fi, and it has expandable memory. Plus I love the way it looks. The keybaord is in the touch screen and hides. I hate how the kindle has a keyboard. When I hold my inlawas kindle I always accidently push buttons!!! Plus the nook has updates to fix kinks. Kinda like the iPhone. OHHH and the battery...if your kindle battery dies you have to pay ( I think 60 bucks) don't swear by that, to send it in. They don't send you the same kindle. They send you the same model but a different kindle! The nook has it so you can change the battery yourself! You can also get back covers with designs and personalize it! You can also personalize the screen on the nook!
Ok so I rambled, But i thought I'd just give my opinion. I do love my Sony e-reader too. It has done me well!!!