I agree 100% with James. I wouldn’t think of it as required for safety purposes, but it sure does make that purchase easier to justify with the wife.
I would get it for its functional benefit. Here are my reasons for getting one.
1. Better gas mileage while trolling.
2. Fewer emissions while trolling. Had a slight case of CO poisoning in my Crestliner last year while trolling with a 125 2 stroke Merc.
3. Much better speed control.
4. Much fewer hours on your $20k motor versus a $2k motor. I bought mine used for $1k.
After one season on it, I think I’ve already justified the cost.