After you switch back to KK, you'll notice the speed and reliability of KK and see how LP in the 5.0.1 versions by Sammy are terrible. I kept LP for a while, but then returned to KK because of the lags in multitasking and taking pictures. Taking pictures lag is still there, but now multitasking is far more usable. Also, battery life is about 20% better every day with exactly the same usage. No complaining about that! I'll upgrade again when Samsung releases 5.1.1, which seems to be a far more stable version than 5.0.1