I dunno it seems like a decent thing to me. You're basically unlocking the trucks potential by taking advantage of what's already there. The issue it adresses is the factory drive by wire calibration. The stock pedal module program provides adequate but not 'spirited' throttle response. The Pedal Commander thing changes the curve to make throttle input feel more instantaneous.

A tuner might be able to do some of this but probably not as definitively as the PC. A tuner relies more on fuel curve mapping.