I went back to the Droid after owning an incredible for a month. The phone was lightning fast but it felt like it was missing something. Most of my main gripes were minor ones but I guess they were enough for me to take it back and use my Droid again.
I never thought about using the 30 day period as a free trial. Good idea. What happens with the old phone then? De-activated? Do you then have to pay another fee to get it turned back on?
I also find myself never using my droid keyboard. Not that I don't want to. But it seems easier just to use the Android keyboard.