No, I do not have the SDS yet but it is on the list....Hoping to have it within the next six months...
I am using the Dynavector 20XL that came off of my Scout...Once I wear it out I will probably go with something like the Te Kaitora Rua....
I am also investigating a 'three-belt' solution that was mentioned to me by Mike at VPI. You can remove the spindle wheel on the stock motor, then attach three belts directly to the motor's drive shaft. Of course, to do this you must have a SDS to control speeds... Mike at VPI said that this would move the performance more towards the results they are gettting with the rim drives on the SuperScoutMaster and HRX.