Really depends on the person. Such quotes ring in the back of my head....
The drag strip is my dyno
Dyno numbers are just for bragging
The tune changes at the track (and day to day)
I don’t have money for a dyno
The drag strip is much more fun than a dyno
I can do it myself (with or without an 02 sensor)
buy it if you like the price, $100.00 USD is what its worth to me.