I made a huge mistake a few years ago. I contacted Brett about a couple of Smooth Moves and he replied with a fantastic price. Money was tight at the moment and the offer vanished when he sold the company shortly thereafter. Kicked myself many times since. Those are some fantastic seat pedestals.
I have never used the smooth moves or the shock master but I have tested the Wave Pro pedestal and after using the Wave pro for two years I will never go back to a pedestal that uses any sort of spring system.True air ride is the only way to go.