Sean Roe's VEC-1 box is definitely one of the best "bang for your buck" products available on the aftermarket. I had the priveledge of testing prototype #1 in my car for hours one day, with an engineer and an OBD-II connected laptop sitting in the passenger seat. When it was time to send it back, Sean graciously let me keep it. Good thing too..... he would have had to fight me for it!
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I usually only adjust mine for maximum response and horsepower when I go the the track. I don't street race, so I tweak it to actually "take away" the jerky, instant throttle response for much more enjoyable cruising on the highway. You will love it!