I own both. While I like the adjustable levels available in the pedal commander and the ability to really dial it up so high that just tapping it launches you forward so quickly, the pedalmax feels smoother and will also make your paddles shift quicker (for automatic trans), not to mention wot downshifts are noticeably quicker than with the pedal commander. Not sure why there's a difference but there must be different methods used to achieve similar outcome (higher output per input). It makes your car feel like it has more torque down low and overall improves the driving experience.Has anyone tried both and have an opinion?