Curious to know what the new 450h+ has, any idea?
Mine is reasonably effective with A/C on max and windows up. The seats cool off quicker and stay cooler this way, definitely better than black pleather without ventilation. Still, a lot of times it's nice to have fresh air, windows down and sunroof open, and still be able to chill your seat.
Better systems direct cool the convective air on the seat, have more breathable/conductive and lighter-color fabric options, include airflow on the butt and lower back, and allow the seat ventilation to remote pre-cool to help on hot sunny days. Toyota kinda failed in these regards, but I guess they save us a mile or two of EV range this way?