I want to get the 50Boys but it's just to expensive. They just started making them to fit our grips. You have to send them your grip unless you get one of there models (more money).
Out here on the open roads it's great to have a devise to take the pressure off your palm. I have tried the "Throttle Rocker" and the other one out there and they work well but are not adjustable.
The Crampbuster is and I've used it for about three years now. They are guaranteed so if it ever breaks they will send you another. They first started with one and now are up to 4 different designs. They now have a wide one for our large grips. All just $11. Mine is always on my grip.
Best thing about this one is you can reset it with the flick of your hand so it will always be right where you want it.
http://www.crampbuster.com/
later,
Ray