This is an interesting topic for me because I was thinking about coming back to Hertz from National. I was 5* for about 3 years and then made the switch to National. One advantage is that most of my rentals are for longer periods and National awards status based on days rented and not number of rentals. However with my increased number of rental days I was considering using Hertz to build up status toward PC, however there doesn't seem to be a big jump from 5* to PC - on paper or in reality.