He did pull out his tweaked Smartass, and replaced it with V2 only, which so far I'm happy with. Been waiting to really test V2 until Imo removed his tweaked version.
Battery, doesn't seem as good as 4.0. Not terrible, and I haven't tried the kernel with IX so I cant say for sure it's the kernel and not the gov, but that would be my educated guess.
I'd say unless you were really wanting to try one of Imo's kernel's with V2 optimized for his other tweaks, I'd stick with 4.0. I did, so I'm going to stay on 4.1.2 for a bit longer. The battery life is certainly good enough to more than get through the day, but I don't think I'll be seeing 20hrs avg, which is about the norm for me on Imo's kernel's.