Bosch Performance CX Powerful, Great Momemtum, Digital feel (on/off) 2min16s Shimano STEPS E8000 Progressive, easy to control and powerful. 2min21s Panasonic Torque from motor is very noticable 2min23s Yamaha PW Output depends heavily on cadence 2min33s Brose Lacks Power, motor engages naturally 2min38s