I've been waiting and waiting for Moto to finally get Smart Actions running right on the Bionic. I think they may have gotten it with the latest update!
I have a smart actions rule set up that shuts off mobile data, GPS, and Wifi when the screen is off to absolutely maximize the battery life available.
The issue I had with previous iterations of Smart Actions is when turning the screen back on, it would take 10-20 seconds to reconnect to the mobile data network...this is obviously unacceptable. This most recent update fixes that issue and it connects to the network within 2-3 seconds for me 90% percent of the time and almost never exceeds 5 seconds to reconnect.
The below screenshots are what I got yesterday on a standard battery with almost 2 hours of "screen on" time. So I did use the phone during this time.