Over the years, I have purchased many different products to improve fuel efficiency and gain horse power on many different vehicles and really had lackluster results. My buddy bought this Pedal Commander and was telling me about how responsive his truck was and how impressed he was with it. After he told me the price was only around 300.00 I was even more skeptical. He sent me the link and I researched and looked at reviews and decided to give it a shot. I am extremely pleased with the results. I am a straight shooter, if its garbage I will tell you. I am having so much fun now driving my GMC Denali 6.6 Duramax. Rick Elder Fort Worth, TX