David, personally I love the concept. Boss Hoss is not the only manufaturer though. I can't remember the company name, but I saw another display while at Sturgis this year.
Many of these bike use a two-speed automatic tansmission which is good for those high throttle egagements but lousy for milage. But then again, who buys a V-8 bike for mileage? They are heavy for parking lot manuvres in general and get very hot on the legs. I think their cool factor is high though. There may be one person on here who will challenge my opinion though...just one.