Hmmm...I really liked CM7 but it tore through battery life way too fast. It's okay while I'm on Christmas vacation but once next week rolls around, there's no way I can have that short of battery life. The longest I was able to hold a charge was 7 hours and that was without using my phone, down to 1 screen, only Gmail and exchange synced, and screen off. I tried 3 different batteries and all the same result.
On the Doomed ROM, I can get 8-10 hours of battery life with making calls, texts, downloading apps, uninstalling apps, playing games, running multiple screens with quite a few things synced, etc
Rooted Galaxy Note