I just purchased an Ultra 23xs with a blown 572 and a dual jet drive. All I can say is that I was initially a skeptic until I bought this. It does everything they say it can do. It stears better at idle than my 19 south wind and it litteraly puts you in your seat when you hammer it. I think 0 to 60 is around 6 seconds. No cavitation and on plane instantly. This boat is heavy compared to my southwind which has a dual holley tunnel ram, built 460 and the Dual jet smokes it. And not to mention one of the biggest rooster tails you can imagine. Sorry for going on and on, but I am sold on it, this is worth the investment.