I am using the epic 1.1 rom now with no issues, came home today (off charger at 645 am) and currently (932p) at 70% with screen on auto dark, yahoo on all day, and a handfull of txt messages and calls. Nothing real heavy, surfed facebook/ny times on lunch for 20 minutes or so.
I can not complain about battery life at all, either on stock or epic.
The bloat being gone is great
After rooting i did rename a bunch of APK's for some of the blur related stuff and saw similar results with battery life being excellent relative to use.
I've copy/pasted the process for doing that below if your interested.
IIRC these are copied from XDA, possibly here, I apologize for not properly crediting this.
Commands:
adb shell
su
mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
cd /system/app
mv CityID.apk CityID.bak
mv Skype_mobile.live.apk Skype_mobile.live.bak
(same syntax for each apk you want to rename - CASE SENSITIVE!!)
mount -o ro,remount -t ext3 /dev/block/mmcblk1p21 /system
exit
exit
List of files ok to rename (case sensitive):
CityID.apk
Skype_mobile.live.apk
MyVerizon.apk
Skype_mobile.live.apk
Vvm.apk
WorkContacts.apk
amazonmp3_1.7.22_signed_zipaligned.apk
Blockbuster.apk (may need to uninstall updates first)
Mynet.apk (3G Mobile Hotspot)
redding-7648-signed-zipped.apk (Kindle - may need to uninstall updates first)