I left Sourcery when 4.2 dropped. Going back to Sourcery was a compromise...or so I thought. That ROM always packed a ton of features but performance and battery life were not great.
It's too early to say how battery life is because I typically judge that with standby time (and haven't really put my phone down for long in the past few days). Performance is better on this ROM than on any other ROM I have used. Running at 1.2 GHz and this thing is flying. I was expecting lag to an extent and haven't seen it. Even when running low on RAM, the phone handles new task with ease. I just picked up my phone and everything was fluid...just to see that I had 78 MB free. The stock Sourcery kernel is pretty bad ass in that regard.
Myself: Galaxy Nexus, Droid Razr M, Nexus 7 (2013), multiple Google TVs
Wife and Kids: Galaxy Nexus, Apple iPad 4th Gen, HTC Droid DNA, Nexus 7 (2013) Galaxy Player 4.0,
Retired: Thunderbolt, Droid Pro, Fascinate, Motorola Droid 1, 3 & 4, Transformer TF101, Galaxy Tab (7" WiFi), Archos 70