I have the gpx8. Haven't used it yet. Got the mounts worked or for my CRF250R, aprilia rs125 and Ducati. Will use it at jennings in Feb. Should know more then. I will compare data to the ducati DDS and see if they match. So in summary, I don't know shit. The Starlane gps looks very cool and can act as a dash unit. Depends on your needs. I bought the GPX 8 used for a decent price or I would have likely bought the Starlane.