I've been happy with it, and it's gotten me a Win & RU in some NMCA Stock/Superstock combo races. Usually if it doesn't run the number it can be attributed to other factors (ie, driver error, quick changing weather, etc).

It's not too user friendly for index racing. I used it many years in NSS running an index. Here I had to determine the horsepower corrected weight to run dead on my index, then adjusted weight to match the HP corrected weight with the new conditions.