I’m currently taking Paul’s month long course in Wales and I’m working at bench designed for someone who is 6’4″ (Paul’s apprentice) and I find that it works, but ideally, I find the correct height to be the one where your arm is close to parallel to the floor when sawing and one where you don’t have to bend over to work the wood. Of course I don’t have much experience yet, but that is what is comfortable for me.