I love my stumpy with the propedal. It really works well, assuming you have it setup correctly. There is noticeable difference between fully open and the propedal position. I rode a friends stumpy with the brain and it felt similar. Although, it was a little more plush over the bumpy stuff. I think his shock was setup too soft for me. And, you don't have to mess with levers when you want the shock to open up to full travel...It's smart!
In addition, I feel zero pedal bob on the Stumpy in the propedal position...same with the brain...