So we were wrong.
Static is a problem in refinishing and anti-static guns do make a marked improvement for painters.
By using the Stat-Gun on every job, between every coat, you can reduce all of the following:-
Dust and dirt inclusions
Colour matching issues
Uneven application (e.g. tack rag marks)
mount of material used
Improve metallic laydown
Increase profitability by reducing turnaround times/reworks/material used
Increase job satisfaction by achieving a perfect finish first time, every time
Bottom line, It's a very cool tool!