First of all.... If your cheap (and stupid) then go get an "extender" and when it jabs you in the knee or leg dont say I didnt tell you it WAS GOING TO JAM YOU IN THE KNEE OR LEG.
Second of all, they look gay
Third of all, I've had stock thumb throttles, twist, and am currently using the moose racing thumb throttle.. And the Moose Racing thumb Throttle is the biggest piece of shit. I mean that wholeheartedly. A well maintained stocker is the way to go.
Twist is excellent if your say..... On a dirtbike
The reason twist throttles dont come on quads is there is side-to-side motion, your using your grip to control the bikes horizontal motion.
On a dirtbike that motion is non existent..... Therefore twist is controllable
And I'll be the first to say twist is easier on the muscles, and you can even get pretty fast with it.... but it just isnt for a quad imo. You need that grip to control the bike