I can't believe that now Optibike has a video on their front page advocating the use of their bikes as mountain bikes. It was alluded to in another post but I seriously thought the other poster was joking.
I feel that there is a great future for motor assist for use as low speed vehicles as tools of transport to get folks out of their cars, especially the highest percentage of single person trips under 5 miles. But the idea of using them for recreation offroad disturbs me. Just get a dirt bike and ride with those folks, don't bring motorized bicycles to the trails, please.