As a PC I can only say that in 2003 the level of service and upgrades has deteriorated significantly from prior years. In most cases when booking a full size I typically don't ever get better than a Mercury Marquis, and in most cases I show up to see only a Ford Taurus, sometimes with Satellite radio (Big Whoop).
While I understand that this is the stated benefit of PC, it is actually exactly the same as 5* and typical of what I have always received through the years as both a 5* as well as a PC.
It is very discouraging that in almost every case I have to ask for an upgrade. This is not what I have come to expect from premium programs. As a top tier on AA I NEVER have to ask for the standard upgrades, especially when I check-in. AA, Marriott and most other hospitality companies have dedicated phone numbers and reservation lines for top tier frequent customers, I am not aware of one at Hertz. Maybe I've just been a PC for so long that I never updated my file but I think that a reservation agent and advocacy team such as the other premiere elite programs provide would be a significant benefit to Hertz elite customers and even more important than upgrades (although these are nice too).
Merry Christmas