I've got one but dont use it all that much. It works pretty good for the price. I cant seem to get the right tension on the spring with it. If it's loose enough for the throttle to snap back when it's off it wont hold the throttle solid when it's on. It tends to ease off slightly but not enough to make that much difference. Works best when your not going up and down hills alot but on flatter roads. Still, for the money it comes it pretty handy when that hand gets tired or you need to adjust your mirror or pick your nose or something. You can adjust the throttle position when it's engaged if you need to. Just dont forget it's on when you start to catch up with the cage in front of you or see a stop sign ahead.