Coincidentally, my sepex GPR-S uses a Sevcon controller and I just purchased the programmer for the controller. The Sevcon controller is very versatile, but seems to be made for use in various industrial electrical equipment and is not specialized for motorcycle use. The programmer that I have seems to work well, but like a lot of electrical things, you do have to know what you are doing. I have both the controller and programmer manuals on my computer as PDF files, should anyone want a copy.