Hi Norm,
Yes I had seen these advertised new. It looks to have a steel base reasonably heavy guage. The self propelleled drive looks to be just a roller that drops down on to the main belt. You would think that it might slip on the taper. I have bought these EBay type of things before. They look good but inevitably do not work very well and end up just taking up space. Probably not much wrong with it though but as you say the cutter bar is not a patch on the heavy blade disc. Maybe if it was $50 & fit a PT.
All the best
Jeff
