Jim
I guess they might make a difference if the water is cloudy
Only way to find out is to fish them in a pair with a plain skinny buzzer, swap the positions now and again and see which, if any, is the most successful.
A comprehensive report, complete with full statistical analysis, and confidence limits, accounting for variables in water temperature, clarity, wind direction, air pressure, weather for the preceding 5 days and time of day would be most appreciated.
Irvine