Ran across this and thought it was kind of cool? http://www.x2cycle.com/ Might come in useful on group rides or just to have one aboard to help a brother/sister out along the way sometime? Sometimes when I am on my MAB and my wife is on her pedal bike I will come up alongside her and put my right hand on her back and give her an assist. This works because I have my throttle on the left because it works out better for me that way. With this I could just hook her up and away we go! If I get one I will report back here.