Originally Posted by WarmAndSCSI

A tune cannot solve the inherent delay with DBW. While datalogging on my Evo, I found there was always a delay between the ECU sending the signal to open the throttle plate, or at least acknowledging that it had sent the signal, and the throttle position sensor actually registering the change. A device like this that actually adaptively ramps the throttle opening rate based upon your initial "punch" is a good way to compensate for this lag.

I know people are saying a tune can accomplish the same thing, but it simply cannot without re-writing ECU code or compromising driveability. I've messed around with DBW throttle tables on the Evo X extensively - you really don't gain anything over the stock settings. In fact, it consistently makes the car drive worse if you mess with the throttle tables too much, especially on a quick-spooling turbocharged car.

That said, I'd need to play around with a Sprint Booster on my Evo to make any fair judgment. It may really not do anything more than playing around with the throttle tables - it depends on whether it's actually "intelligent" or adaptive in any way.