I came from SyndicateROM Frozen 1.1.0 and flashed SyndicateROM Frozen 1.1.1 the next morning after its release, and the battery life is pretty close to 1.1.0, maybe slightly better, I haven't noticed a difference when using it (still great obviously). I did however notice that my phone seems to be faster than the previous ROM, which is quite nice. Overall I'm rather impressed with the latest ROM, and loving it.
Install couldn't be easier coming from 1.1.0, put the ROM on the sd card, shut down, boot into clockwork (I already had 3.0.2.5) and flash it without whiping anything
ACS rocks (special nod to mysteryemotionz, who I hear put in a lot of the time/work on the new version).