I recently installed the thrustline kit on my Dads PA-18 for him. I would not have believed how much better it flew if I had not flown it myself. It took a average to below average flying cub and turned it into a way above average flying cub. The quality of the product was top notch, installation was easy. Mark was a hugh help on the Tech end of things for measuring up the cub before hand and after as well as on wing rigging. It is a rarity in this day in age to find a guy with his kind of integrity that will stand by his product to the end. If you are not happy with it he wants to give you your money back. He even did a couple follow calls to make sure we were still happy with ours. My hats off to you Mark.
Shawn
Shawn