I sort of inherited a 6 month old 2001 Yamaha XR1800 back in 2002. An inlaw back then had bought it and after getting tossed from the boat somehow one day, he wouldn't set foot in it again. After a few months I realized what a mess those boats were. There was some recall about them stalling, another about them being unable to draw all the fuel from the tank for some reason. The boat had 14 hours on it when I got it. It was incapable of not stalling on deceleration. Every time I backed off the throttle both motors would die. The dealer tried everything but couldn't solve it. They made it slightly better but any sudden decrease in throttle meant both motors shutting off suddenly. This was a big issue around the docks as without power, a jet boat cannot steer.
Both front seat bases shattered on the second time out on the water. Both were cast aluminum and didn't look heavy duty enough for a 6 year old let alone for two adults, my self at 225 and my ex at about 140 or so. They replaced them five times, the last time they told me I was too big for the boat and they were not going to honor any warranty after that.
The boat leaked water in the bow, water would rush in between the upper and lower halves of the hull, as a repair the dealer smeared what looked like clear silicone all over the rub rail. It did little to nothing for it.
The boat also would kill it battery if it sat. Even if sitting at the dock for a few hours was enough to draw down the batteries. I added battery master switch since the dealer failed to fix it after four tries.
I got lucky that winter and someone offered me far more than I thought it was worth and I never saw it again. I had the chance to own another one a few years ago for free, but wasn't in the least bit tempted.
I figured if a new one was that bad, I didn't want to know what one was like after 20 years or more.