It's all very frustrating. Be careful what you wish for. I find my phone to be pretty stable now. My battery life isn't what I'd expect but I am pretty sure it is due almost completely to Words With Friends but I love the game.
My point is that any update usually brings with it more bugs and things to track down and figure out than it fixes.
The memory leak in 5.0.1 is really starting to annoy me. But that's really it. I can afford to wait. No performance issues
Posted from the one and only Note 4