Let me start by saying that the steering on the Mantis Pro SE is pretty stabile to begin with. I added this to ensure stability while riding one handed (EG: adjusting my back pack or helmet visor, etc.)
It works great and makes the steering feel very solid, even when riding at 40mph!
I would deduct 1/2 star if I could because it somewhat limits the steering range. This can make the scooter difficult to maneuver when you are parking it in tight spaces. (Does not affect while riding.) If the damper rod were another 1 or 2 inches longer, this would not be an issue.