I recently acquired a lightly used SB and installed it my Limited 6M and, after having read several threads about the pros and cons, whether it just alters throttle/pedal position, etc I have/had my own reasons for wanting one and here's what I like and don't like about it:

My Crossfire is a weekend toy and replaced a Mazda Miata. That car had very snappy throttle response and at first I was really annoyed at how incredibly un-snappy the Crossfire throttle felt. Downshifting was difficult at first because it always felt like I had to floor the pedal in order to bring the revs up to match on a downshift. Heel and toe downshifts were almost impossible to accomplish smoothly because I couldn't position my foot properly to adequately brake and still shove the gas pedal all the way to the floor to bring the revs up. The car always felt like 50% throttle position would bring the revs up very, very lazily. I really didn't care for it and it was my only real gripe about the car.

With the SB installed downshifting is a dream.... just a quick blip of the throttle and revs are up and the selection of a lower gear is smooth as butter. Heel and toe downshifting is likewise pure joy now. Blipping the throttle is now a reality, whereas in stock form I can't honestly say I could "blip" the throttle - I had to mash to bring the revs up.

But it may be a bit oversensitive for moderate speed launches. In stop and go traffic I don't have an issue at all; just very light and easy pressure on the go pedal and the car rolls. But moving away at a moderate/moderately quick pace is hard to do smoothly. Granted, I don't daily drive the car so my time behind the wheel isn't as great as it could be, but at times it's almost annoying. I know I'll get the hang of it, just as I (sort of) learned to live with the very slow throttle action after moving out of the Miata - and I am. But it is touchy.

Quite honestly, if I had an automatic trans I don't think I'd like the SB at all and would probably consider it a total waste of money. But in a manual gearbox car, it totally transforms the driveability of the car. Whether it does so by simply altering pedal position to actual throttle position or not - and everything I've read says that's actually all it does - and whether or not there's really nothing left to give after 80% (or 50% or whatever) throttle position isn't really all that important to me. And, yes, it does seem to be quite a bit of money, at full retail, for the simple parts contained in the device, but that sort of misses the point too. Come on, what have others paid for a CAI that's nothing more than a big ol' tube with a cone filter on it? No, what's really important, what you're really paying for, is how this simple (and simple to install) device literally transforms the way the vehicle behaves.

I paid more money for my Magnaflow exhaust, which does nothing for the power or driving dynamics of the car, but it looks awesome and sounds glorious. To me that was worth the cost of entry. But with the SB the arguments seem to center around exactly what it does from an electronic standpoint. But that, in my mind, completely misses the point.