Same here. After a while I felt like I was paying more attention to what the seat was doing rather than watching the movie. Was fun to try, but I won't be paying for it again.
I've see one. That was 3 years ago. It had Michigan plates and was passing through the state on the toll road. I'm a huge fan of the GT. It looks like nothing else. I can't remember that last time I saw a Heritage for sale. I'm sure some digging around would find one, but they're not readily for sale like they were just a year ago.