Well like I said fast RPM response is very important. Governor mode is not necessary because it is better to set up throttle and pitch curve on a transmitter for 4D and another setting for 3D or for classical aerobatic flying. This way, modes can be switched in flight. To switch of governor mode on an ESC means programming on the ground. So, only important feature for 4D flying is a fast RPM response. Everything else is same as for 3D (minimum weight, cut off,…). Oh and more affordable price than CC Phoenix ESC.