I remember reading about the pre-release info on the EVO and saying to myself, "4.3 inch screen? What's up with that? What an odd choice... why not a 4.0- or 4.5-inch screen? But 4.3?!?!?"
I stand corrected. The 4.3" screen on the EVO, without a physical keyboard, really works for me. In fact, after several days of regular use, I believe the 4.0" screen would be too small--and that a 4.5" screen actually would be
too big. The engineers knew what they were doing. Further proof: Motorola chose 4.3" for the Droid X...
The battery life thing is variable, really... the more you use a phone, the more battery you're going to use. The
usability of the EVO, in comparison to the relatively clunky performance of even recent BlackBerries, realistically means shorter periods of (more intense) use between charges.
I've disabled all the social networking nonsense, and set only my Gmail and work-related Exchange accounts to sync on a regular basis. Further, I've set priority hours for the Exchange account, updating far less frequently outside work hours. I'm perfectly happy with the battery life on the device.
(I also disabled the News/Weather sync as the Airave in my house incorrectly assigned my location to a city several hours away, prone to much different weather and temps).
I used my wife's Tour today, trying to get a problem with Google Sync fixed for her (without success, unfortunately). Wow!!! You mean I was using
THAT screen for the past year?!?!?

The difference really is amazing.
Again, my sincere thanks to all other BB users who posted their own experiences in the BB-->Android transition. I hope I've provided useful info as well.