Nice find! I have the double chain version of this pedal. The bent plate is nice if your playing on an uneven floor or over a transition between carpet and floor or a seam between two pieces of a riser. The pedal will always rest on the spot under the heel plate and not on a high spot somewhere else under the plate. It makes it so the pedal is always level and you're never twisting the hoop by playing with the heel of the pedal off the ground. I like the bent plate and think it's useful but Yamaha must not have thought it was a game changing breakthrough because they went back to the flat plate design for the 9500 series.The bent floor plate is an interesting twist. I wonder why they did that?