I was supprised at the amont of throttle lag and thought there there was something wrong with my car at first. In fact most cars have this problem with the fly-by-wire set up. Having said that, I was dissappionted with the small improvement from the S/B and nearly returned it for refund. However, when I did the throttle rest as well - wow - a differnt ball game. I therefor recomend that with the S/B fitted, you will also get extra added Ooomph if you do the re set as well.
(yes I agree the price is way too steep, but thats business!)
Steve