I've added this Ulnar nerve stretch to my mix of exercises and it feels pretty good. I don't hold the stretch though, just go to the tension three or four times. Holding a stretch still doesn't work well for me. I like movement better.
I really wouldn't consider it one of the top three TOS exercises though. That's just his opinion. I'll bet if you asked everyone here what their top three exercises were, they'd all be different. It changes for me all the time.
http://www.youtube.com/watch?v=Z4aXR...eature=related