Very good explanation of the differences between spey and overhand. I can only add that once one decides to go down the road of casting with a two handed rod one is immediately thrust into a world of learning that will never end. Another thing I have learned is that if I ask 20 spey enthusiests how to cast they will give me 10 different styles. Simon is different from Cook, is different from Kinney.
Juro one day I would love to get a group of guys together and we could gleen some of that vast knowledge from you in a group casting lesson.