A couple of important points from the video
- the sound level doesn't increase when you turn on the motor. Of course it doesn't because the motor isn't running! It only runs when you feed electricity to it.
- it uses less power at idle than a clutch motor. Of course it does, see above answer. A clutch motor runs continuously once switched on, a servo doesn't.
It may very well be a nice motor, and I like that the speed can be varied without having to delve into the menus, but this sort of advertising does you no favours.