I have one in my pedal set up,and i play bossa,samba,latin and bebop jazz music. The problem with this pedal is indeed the rebound effect. The spring is too weak to pull back the heavy shaft and beater,not much help for the speed rebound effect. And the are limited adjustments sa Beater and footboard angles. And the footboard metal bearing (which push-slides the beater shaft rubber) at times is cascading with the metal shaft.
-Sunny,HotSpotJazzBand