matt,I will disagree,SLIGHTLY
I like the Pro Tuner,easier to adjust.
http://britesitetuner.com/Pro_Tuner_Rests/body_pro_tuner_rests.html
Mobo,reliability and simplicity are just a couple reasons.The reason you see more spring steel on the bows of the pros is due to forgiveness and guidance.The spring steel just provides more guidance which equates to forgiveness and does it while be very simple and easy to tune.