I'm running the "leaked" 2.2 USCC build that was released on XDA at the beginning of Feb. I am not sure if its much different than what was officially released. It doesn't sound like it, because I am experiencing terrible battery life as well.
The main advantage I have found with root access is Titanium Backup works extremely well with the phone. Combined with Dropbox I have a setup that automatically backs up to my SD card and Dropbox every other day (changes only), with a full backup weekly. Titanium also allows me to "freeze" bloatware apps that I don't want running, but also don't want to uninstall since they are part of the stock OS build. It has helped the battery life issue somewhat, but not nearly to the level I would like.