There's no motor included, which is admittedly scary, you gotta wonder "why", but it's a solid ramp, the issues only ever lay in the ability for the rings to move in synch correctly.
To the poster- why not buy a motor, and make a video of the vortex in action? You'd probably be able to get more out of it and it'd make the decision for someone to buy easier knowing and seeing everything work. It's a little harder in your end, but might work better for both parties, I wish you the best in selling it either way! :)
Was moreso wondering if my owner actually bought it. Was hoping to get one of these and this one seemed it would fit nicely.