In the ebay ad it says "black compound" base.......I could be wrong, but I believe this is their nice way of saying 'asphalt' base. The butyl-based products (Dynamat, Secondskin, RaamMmat) have a greater resistance to heat than the asphalt-based products. Just something to keep in mind.
The advantage of the asphalt products, however, is that they are generally less expensive.
I wouldn't normally use an asphalt-based product myself, but if I had to then I would probably consider it for the floorplan - but not the doors.