Well, there is only one expression to describe the ski, MIND BLOWING; this thing has power to spare. I'm used to the usual rental ski, more likely neglected and beat to pieces by the renters and staff. This is the first brand new one that I've owned and I'm extremely pleased with its performance.
I've only put 5 hours on the ski and only taken it to 3/4's of its throttle (as per the manual), but you can tell that it's got the go-go juice when your passanger flies off the back of the seat when you pull on the throttle (just ask my wife!!). The ski is rock solid at speeds over 10 MPH, but somewhat unstable below that treshold.
It is somewhat pricey, but it is worth every single penny that I paid for it. When doing my research on which ski to purchase, I looked into the Supercharged Honda Aquatrax, the Yamaha and this one; I am very happy with the desicion that I've made... I love this thing!