We have 2 Yamaha jetskis. They were both bought used but one is newer than the other.
Jetski A is older, but it has a 50% higher max speed (60mph according to speedometer) , is smaller, has MUCH looser steering, is very unstable with more than a single rider and you will get soaked will riding it.
Jetski B is newish, has a max speed of ~43mph, can fit 3 people fairly easily, is very stable and almost impossible to flip.
I absolutely love riding on jetksi A. And yes, this has almost nothing to do with the OP so here:
Yes, I see jet skis pulling tubes or water skiers all the time. We have a house on the shore of Lake Norris in Tennessee that we go to about twice a month:
http://www.home.fuse.net/norajm/dock.jpg
Along with the 2 jetski's, we also have a
Sea Doo Challenger
and a 18 or 22' Suntracker pontoon boat.
Me being awesome a year or two ago:
http://img209.imageshack.us/my...norrisjune07003gb1.jpg
I've flipped jetski A (the one in the pic) numerous times. It's very easy. I've only flipped jetski B once, and that's because there was three people on it.