I think most people use Core Nano motors but DJI alone is very underrated for its performance. First, it works with the native focus wheel, which is a big plus. But most importantly, it has way more torque than I thought it would. Calibration is very easy and mostly just works. A focus motor is a MUST if you have manual focus lenses, there really is no good way to shoot with a gimbal and manual focus lens without a motor. If your camera has autofocus and it's good, you probably don't need it.