When I worked in a bike shop on Long Island. NY, the Alenex salesman pitched the owner hard and we wound up with a few. I and other mechanics/sales tried to dissuade owner based on mechanical, parts availability and won't-sell reasons. We each really wanted to actually sell one once we did have them, but no takers.
I think the owner made some deal with someone because they all disappeared. I don't think we sold any to an actual customer.
If I remember correctly, there was some type of crazy reverse sprocket/freewheel on the NDS?
Anyone out there actually build one besides me?