I usually get about a day and a half of battery life, with the Neo suspended whenever I'm not using it, and usually with GPS/WiFi turned off until I need it. There are however people who think the Neo could potentially go for even longer, but it's already comparable to what the original iPhones seem to be getting anyways.

I don't yet use it as my only phone; because of the suspend issues, I have to have a more reliable method of being reached, so I still carry my Razr with me, and have my calls forwarded whenever my Neo decides not to come out of suspend, but the Neo is still my primary phone otherwise.