I\'m not a fan of 2 shoulder buttons per side. On GameCube, DualShock and the new 360 pad, it never felt natural to me.
I don\'t mind them, I just think they hold the controllers back from their potential so far. For best controller design I like the new 360 pad and elements of the Xbox S controller and Dual Shock 2.
For its purpose, the NES pad was my favorite. Ergonomics be damned.
-Dan