I have used aosp up to 6/1 I used bumblebee for a week, and I am currently using reborn. Aosp had too many glitches, but ran smooth and had decent battery with xionia kernel. Bumble bee was ok, but wasn't real quick, it did give you alot of internal space. Reborn is very quick, and stable. The battery is as good as any, the rom as doesn't give you much internal storage, I partitioned my SD and got link2sd, it took me some time to figure out, but now I have 105mb of internal free space, and that's after installing 65 apps.. reborn is my favorite all around, its the quickest, it's got as good of battery, if not better than anything else, it looks fantastic, there are flashable themes on a thread here. And once you figure out the whole link2sd thing, you have tons of space