My verdict is in. I own a 2002 F150 4x4 flare side with the 4.6L automatic K&N filter and Duel exhaust (Exiting infront of the rear pass side tire) I got the Hypertech programmer III I bought into the name) and while the results were noticable they were not drastic so I followed the majority on this site (I rarely do that) & swapped to the Superchips 1715. In the Performance tow mode (I pull a trailer with my snowmobile on it in the winter) with all the settings at max the differance is nite & day. While crusing down the road if I nail it the truck flat out goes no matter what speed I'm going. If you want to burn up the tires then from a dead stop straight ahead it puts out a decent squeal (both the Hypertech & the Superchips were close but the Superchips did seem a little bit better) but do it on a slight corner & the rearend breaks loose like crazy the rpm's hit about 6g's & all that came from the back was blue smoke & a great howl for aound twice as far as the hypertech did (the guys working on there Saab stopped and stared in disbelief). For a moment I was worryed about toasting the motor but hey it's under warrenty. It's winter up here in Maine and I can't wait till summer when I can test it when it's warm (I ran the Hypertech in warm weather) once I step up to the performance mode (No towing) I expect even better results. Look out you lowley Dodges & Chevys the way I see it the only vehicle I need to worry about will be the one with blue lights on the roof or in the grill. I can tell you from my seat of the pants experience spend the extra $50 or $60 it's worth it. Hmm maybe I'll put in a supercharger next my local speed shop recommends a Paxton. Once again all testing was done by the seat of the pants.