If you're grabbing the grip too hard at all times of course you'll get a cramp. My suggestion is for distance riding, not back roads twisties. If this is what you ride all the time then you should not use a friction lock device. Of course the term "Friction lock" is a misnomer, since it really does not lock anything. If I want to be a "Cop Dodger" I can change the speed at anytime by twisting the grip back a bit, the Vista Cruise will set it, if I want to decelerate I can do that to by twisting the grip forward. Still if I have a 8 to 15 mile stretch to ride I will flick the unit on and relax.