yeah i got to feel, with the exception of machines like the vivace, the flite v2, etc., most rotaries don't run comfortably at 120cps nor require it. i would suppose because a lot are 4.5, 6v type motors with the required torque to get the job done at a lower cps efficiently. while 12-24v motors can run at a higher cps with a different torque set? im not sure if that's correct or if im talking out my ass, just from what i can perceive. i'd like to know if that is how it works because just from usage of rotaries for example like the vivace and the halo, i run my halo between 8-9v well, and the vivace at 8.5-12v. obviously different cps at those volts but will perform similar at those different volts.