randomlinh
Lifer
I use the 3G. I often buy books when I'm not at home - traveling, on the bus, on the tarmac of a runway waiting to take off. I've used the 3G for simple web browsing (like the email example I mentioned above) from time to time too.
If the price for the 3G add-on were high, or if you had to pay for the service, I would understand going with wifi - but for $50, its definitely worth the upgrade.
eh, I think it really depends on the person. I did not find it worth it at all. I figured web browsing on the kindle will suck terribly, and it does. Rarely will I not have enough to read. It's mostly used at home and on the metro. If I travel, it's mostly to friends and family, who all have wifi.
I felt it was better to put that $50 toward a couple of books and a case, heh.