NancysToy
Motorbike Professor
I had a crampbuster (or a similar brand) for several years on another bike. Here's the only issue I see: Without the cramp buster, in a panic situation, you only have to open your fingers to release the throttle. With the cramp buster, you have to completely remove your hand to release the throttle. I don't think this is a big issue, but just a consideration.
It is, however, very useful if you don't have cruise control.
It really isn't safe to release the throttle in those situations. You cannot count on the return spring to work without fail. You should always turn the throttle off forcibly. If you are in a panic situation, hit the kill button. nojoke