I was searching for spey casting info when I came across this. Though it’s really just a commercial, I still found it interesting. Thought I’d share it here where I know there’s a spey or two.
In my mind, I can see where the hands being in different planes would change the leverage points from a straight handle rod. It would keep your lower hand closer to your body, and seems like your upper hand wouldn’t have to travel as far. I dont’ know, was hoping some of you two handers would.