Well, let me speak to that just a little from personal experience. Prior to my recently departed 4Runner, I had a 2011 F150 4X4 with the 5.0 - that was 360 HP right out of the box - it was peppy when applying enough throttle but I wasn't thrilled with the transmission shift patterns. So I bought the SCT programmer with a couple of mild tunes that promised to improve tranny performance -they didn't. I really didn't want to spend another $125 for a "super tune" but I did. Holy leapin lizards! Throttle response, firm shifts and seat of the pants performance was unreal - I didn't end up using the tune all the time as it required 93+ octane but what a kick in the butt to drive! No regrets at all but when all was said and done I had over $650 invested just in the performance aspect. Other than expense the only downer was the 15 minutes it took to upload/download the program and praying for no glitches which, one time, there was. Fortunately for me SCT was only an hour's drive to get to. Next came the 4Runner which is almost undisputed as being a rugged, reliable, go anywhere vehicle right off the showroom floor - but their rated 270 hp is sound asleep until you're about 3/4s into the throttle travel. So after researching many forums/posts with hugely positive reviews on the subject, I pulled the $300 trigger for the Pedal Commander. Pros: 3 minute installation. Pros: seat of the pants acceleration modes - Eco (normal), City (remarkable difference) Sport (instant throttle) and Sport Plus - (never use it as it's rediculously over awesome). Each mode has, within itself, 4 boosters you can select to increase response even more. Now the kicker Pro: to change modes or return to stock all that is needed is the vehicle to be stopped - don't even have to take it out of gear, just stop and select whatever mode you want and go! The Con: the initial $300 and mentally knowing that the device does not add one iota of additional horsepower - it's all throttle manipulation! A lot of us live for the quick acceleration that tunes offer but I can tell you that if I had no mechanical knowledge at all and I requested a speed shop to "make it peppy" - they could have told me they supercharged it at $700 while just adding a PC and I'd a bought it! So, after updating my headlights the Pedal Commander will be soon be added.