The AVS isnt worth it as an option thats why not many people got one. Pretty hard to find too.
Nah its not, was in a Prius taxi yesterday and been in plenty of them, they ride really rough. The IS F-Sport is marginally better but not much of a difference. The IS tends to smooth the edges off, the Prius hit potholes and felt like it was on rock wheels.
Its like the saying the CT Advance is smoother than an IS F-Sport. Nope not the case, the CT loaner I had last week when my RX went for a service was shocking in terms of ride quality.