The ceiling mount provides ample scope for different ceiling heights and is of robust construction (all-metal). Vibrations occur only when mauellen focus the lens; but that makes it so rarely. So no problem. The 4 mounts for projectors were sized unfortunately a bit short for our Kindermann projector. For 3 fixing points handed the room. The 4 mounting hole was due to short sleeves not be used without tinkering. - War but doable! All in all - Recommended!