Data Logger Worth it or Not?

[GTX JOHN]

My son Jon and I have similar 340 Stock Demon.
He dyno's his engines and has a Data Logger with
a lot of channels.

I do not use either one of those and mostly scratch the
seat of my pants.

Last week at Sac we ran side by side at the same exact
weight and the finish was '.003 in my favor.

Of course = He reminds me I was racing over 30 years in these
cars when he was born.!