Been 1 month caffeine-free now after being a 4-5 cup per day drinker like you. It really does feel awesome being self-sufficient and not relying on it, but I don't know if I'll stay off it for good. Don't have any strong reason one way or the other. One thing I've noticed is that I dream A TON more without caffeine (or at least I remember more of my dreams). Probably means I'm getting better sleep.