I actually just picked one up a few days ago, and couldn't be happier with it! I definitely read more now than I did before. It's very convenient to be able to just buy books from my couch or my bed and read at will.
I did get one with 3G - but only because that was the last one they had left on the island here on Oahu. I didn't feel like waiting for shipping
BestBuy got a shipment of 200 in at 10am two days ago, and they were all gone by 1130! Craziness!
I still haven't delved into the Epub things. How do you even access that?