Ok now it's Seadoos turn huh? I have never seen the likes of problems you have. I own a 2009 RXT-IS, the proper name. Either you had a substandard dealer or just another big dose of bad luck or bad carma.
MY Seadoos have served me very well, even the radical 2006 RXT RIVA STAGE III with close to 300 HP which runs 75 mph @ 76 hours. My 2008 GTX 215 which is a RXT 215 on the inside has never missed a beat @ 53 hours.My 2009 RXT-IS never had a problem until I twisted the driveshaft spline at 29 hours, or course I drive it like a MX bike. Which Seadoo replaced for free. The suspension works very well either in auto mode or manual, the new S-3 hull is great. It does have a slightly higher center of gravity due to the suspension, making it a little more tippy at idle only. Whats this 57 chevy crap, my steering is flawless no squeaks. There is no way any of your skis would keep pace in open water with the RXT-IS guess everybody is entitled to their opinion.
Any problems I have my dealer J&J Watercraft is quick to fix or over the phone assistance. Heck I even go jet skiing with them.
Maybe you should go to Kawasaki

and try out their FINE MACHINES.
Where is that Ernest?????
Watching your posts is liking watching the movie "DUDE WHERE'S MY CAR"