I'm still on .45 rom but with this latest .55 kernel and I can say that the battery is improved. I can not tell anything about the responsivness since also the previous ones were quite good from this point of view.
Nexus 4 - 16GB - Stock 4.3 - rooted
Nexus 7 - 32GB - Stock 4.3 - rooted
In-house: RAZR i (stock 4.1.2 - rooted), Defy (CM10.1) + Galaxy Tab 8.9 (ICS stock- rooted)