IMO, it is a big help once you learn to work the tree. The potential (no guarantees) improvement comes from two areas:
1) Reacting to the top bulb (first flash), can be more consistant
2) Adjusting the total RT with a computer is easier and more consistant than adjusting the driver or the car with mechanical changes.
So when you add those together, plus a good driver, the average RT of a delay box class is much better than without it. Roughly 0.010 vs 0.030 comparison, plus or minus. Your mileage may vary...
![](/ubbthreads/images/graemlins/laugh2.gif)
Ask the track operator to average all the RTs from last years delay box class and the same for the non-delay box class. Then post the results. Even an average from one big race (7-9 rounds) should be enough to make the point.