It is a really underused, but very nice flourish. I think the teaching of it in Sex Sells is a bit more detailed than Hit the Road, but the DVD is definitely worth it for all the other material.
By the way, I don't know if anyone else has done it, but I do a variation of Yo where the spread twists as it goes up. I call it "Tournez D'Yo". It's not a particularly incredible innovation, but it adds a little something to the original move, and I like the name.........