yes, sit on numerous Vios rear seats during work trips from Selangor to PG. It makes my back sore, not to say even my manager feels the same cuz at first i tot it was just me and my picky buttocks. Sitting on the front seats are very comfy though even for long hours journey.

To clear my doubts i went over to Toyota Glenmarie to personally test drive and sit on the rear seats while my fren test. The seats are still upright straight, no changes whatsoever was done. It would be great if there are more padding there. Asked the SA, and he admits its abit straight and immediately offered package to rewrap the seats with leather and extra padding.