I finally sat in the back seat of our 5-seater MY a couple of weeks ago while parked waiting for the next ferry sailing and killing time. (I'm always either the driver or front passenger while my partner drives, but her young-adult son sits in the back when he's with us.) I was actually quite shocked at how firm the bottom is. I didn't find it terribly comfortable. I sat back there for about 20 mins or so then went for a stroll instead. I don't think I'd want to sit back there very long, and that wasn't even in the middle seat.