I know on my touch pro using att 3g over edge. they have 3g where I work, but not at my house. so I always just use wifi at my house, but don't bother at work because the 3g is fast enough. I can definetly tell the difference. granted there is wifi almost everywhere these days, but with my touch pro I have to turn it off and on when I'm using it so my battery half makes through a day. It will be nice if the N1's is more of a automatic thing, if that makes sense. I guess if I knew that t Mobile would actually be implementing 3g in my area at all soon, it would be an easier decision, but I haven't found anything to make me think they'll be adding towers in York, PA any time soon.
Samsung Nexus S 4G