i got one fore my moped.. works great so far.. hear you can make them for a lot cheaper though with some pvc pipes and bungie cords
i have done that in the past, but its not that strong. The bungees are a pain and the pvc keeps sliding around on the frame.
i got one and loveeeeeee it there awesome. dont get the one that stands it up they can ding your board easily. i have the sude rack one