I have not, but that's because they do two very different things. The Sprintbooster decreases the time it takes to deliver a signal from the throttle pedal to the throttle body where as the Flashpaq makes power with fuel trim and timing adjustments. I really don't feel like it's an either/or scenario as if you are only going to have one, I would pick the one that actually adds power as opposed to the one that makes it feel like you added power.

Here's a little chart from their site that places a little perspective on it. Also note that while the Flashpaq changes low end power, it does nothing to address the throttle lag.



Also note that I was highly skeptical of this product and ended up with an opportunity to try it out. For me it isn't a perfect fit as I do a fair amount of highway driving, but I certainly enjoy it around town. It certainly brings as much or more seat of the pants feel as an exhaust or intake upgrade, while in practice doesn't add an ounce of power.

 

I would be really interested to see if anyone's gas mileage drops. My guess is it will. Since the product is just changing how the computer translates the throttle position, a slight tip-in Sport takes a little longer tip-in when stock, but the same amount of air and gas are being used. Make sense?

I tried out a product that had a throttle response adjustment, and it didn't make sense to me. It "feels" faster, but it's not.

I guess it's just a personal opinion. I would pay money for the Flashpaq because it actually changes the tuning and creates more power - I wouldn't pay money for something that makes me think there's more power.

Just my $.02....