For the last 5 years i've had a special license that allows me to use a scope in Colorado during muzzleloader season. I've never used it, because I felt I had an unfair advantage over the other hunters.
I struggled along with primitive sights and had to be within 30-40yds to take a shot. Now, I can't even shoot that far and make a humane shot. So, this year i'll be thinking of the game instead of the other hunters and use a scope.