I have a GS3, FB Home was a neat idea. It's decently fluid, little bit of lag occasionally (Carbon 4/8 nightly with KT747 4/11). But it obviously reduces the functionality of your phone; not practical if you plan on using your phone for more than just FB. But it could be cool if you could sideload it onto an old deactivated phone or something.
FB Messenger chat heads are fantastic. Fluid, fast, fun to use. Although, I don't always seem to be able to receive my notifications though. SOmetimes the messages aren't pushed to me and I have to refresh the app in order to receive them. Does this happen to anyone else? FB messenger is running in the background according to Watchdog.