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You'll find hundreds of posts on the board with people testifying positively. You may get a few answers here but generally once someone makes their purchase you don't see them back on this section (working chips are pretty much out of site/out of mind type of things).
I took some time off work last night to install mine (it was delivered yesterday morning and I couldn't wait any longer). All I can say is WOW! You won't believe the difference! I'll never own another truck without it. My 7000#+ V10 feels more like a sports car than my stang, except I fit in it. I can even feel the difference just putzing through town @25MPH - just wiggling your toe makes it jump a little. I used to have to push the gas at least 1/2" to feel any speed increase, but the throttle response is so much better now, seems like less than 1/8" movement feels like you're "off to the races" comparatively.
So, then you tromp on it... It actually shifts at the point where your brain used to start screaming at it "SHIFT! SHIFT! C'MON DAMMIT, SHIFT!".
I got the Perfomance/Towing setup. Can't wait to see what the difference will be in pulling around my 35' TT. If I get half the improvement lugging that monster around, I will be absolutely thrilled.