Is there something different about the seat that would keep a passenger from being able to sit on it, aside from the lack of a strap? I've never had a passenger that actually used that strap so that wouldn't be much of an issue, but I wasn't sure if there was something different about the seat, other than the foam being thin.
The tall seat from the 05-06 9sx is definitely a fun seat to ride with. Super tall, easy to move around, can scoot my butt all the way back. The only downside is when I'm used to that little lip on my low seat catching me when I really get on the gas, sometimes I don't think to hold on and slide back a bit haha. I just wish it wasn't so ugly(9sx seat, not the solo seat), but maybe if I trim mine down a bit I'll like the look of it better.