The DS series is small and simple to install, as it just plugs into the stock diagnostic port under the rider's seat. One quirk: On bikes lacking an internal gear sensor (including the Ninja), the unit needs a moment, with the clutch lever out and the wheels rolling, to calculate gear position based on engine rpm and wheel speed. Most of the time that's fine, but you can get ahead of the process. Declutch and kick down several gears coming to a stop, for instance, and the GI Pro will not know which gear you select to pull away until you have in fact pulled away. Not a serious problem, but it's notable.