It is so cool for sure to see same results into different apps! I saw this one aswell: http://www.themichaelsmith.com/2013…-character.html
Hey, that’s me! 
Figured I’d post what I learned as well in doing this setup. I used a path constraint/spline solution as well in 3DSMax.
One advantage to this method is you get to use the move tool directly on the controllers in order to change position (as opposed to only using the slider values in panel, so the animator can rotate and move the controller without leaving the window). Are you guys seeing that too?
A disadvantage though is that you get gimbal “flipping” of the controller (you can see this happening in my demonstration video if you watch the colored axis rotate past 90 degrees, it only affects the ctrl and is not noticeable in the trunk).
One question I had for Jeff Brodsky is that it seems when he adjusts his “falloff” attribute, it seems to increase/decrease the total rotation of all the joints (whereas in mine, if I have a control rotated 45degrees it spreads that equally among the joints and never changes). When Jeff lower’s his falloff to get a tighter pinch it looks like his total rotation also increases. I’ve been meaning to ask him about that.