1. actually you can only use the web browsing with the Wi fi and not the 3G
2. I have the 3G and Wi Fi version and I find downloading fast on both, Wi Fi generally has the reputation of being faster.
3. The only disadvantage is the buying on the fly no matter where you are. For example sometimes when I commute I can pull up a newspaper and purchase it even though I'm not connected to Wi Fi at the moment. Another example is when I was at work I went on to BN.com and bought a couple of books. Turned on the Nook and it was there waiting for me.
I didn't have the choice when I bought mine, so I can imgaine the back and forth I would have been going through. It really all depends on how much you value having your book purcharsed on the fly.
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