I installed one on my Viper. For the high torque scooters such as the Viper, etc, the ability to lock the trigger on and use your left hand to give the right side a rest is great. also, i am like Don, in that i only want to use the light head in my right hand as a matter of course, but relish the ability to hold his secondary handle with my left hand and roam my light around. for some, this is a solution in search of a problem, but i like the flexibility at a cheap cost.