Ok ... I wont flash 4.4 then hahaha ... i will be like you lazy to flash back to 4.3 ... lol ... Was about to do it right now until i read your post ... i see other people also complaining about the 4.4 being battery consuming (on nexus 4)
Yeah , i saw a few video clips about their codings and all i think they really improve a lot and makes things easier for developers now.
Depends on what you are looking for and if upgrading S3 to a more stable and smooth phone , I say get it !