I cant see the video, my connection here sucks. Why not? There are much better uses for four one hundred dollar bills.
Im not saying extended arms don't have their place. I have one on both my 87 LT250r, and one of my Tecate-3's. They both have major issues keeping the front end anywhere near the ground. On all four of my 86's though, an extended arm was not even close to a feasable purchase.