Join Date: Jul 2001
Location: Near Pittsburgh, Pennsylvania, USA, Earth (PIT)
Programs: Airline/TSA Avoidance Platinum, Hotel Disloyalty Silver, Hertz 1.7*
Posts: 5,277
With the Prestige cars, it's a very specific reservation, and you should get exactly that model. I suppose there is a small chance it wouldn't be there, for reasons outside of Hertz's control (someone else didn't bring it back or damaged it, etc. and they were all reserved that day). SFO has so many cars, though, that I can't imagine them not finding a suitable replacement.
Just in general, for non-Prestige cars, I've done this twice, and I'm 1 for 2 on exact model. Twice I have reserved a Mazda 6. At SFO, for a one-way to PDX, they gave me a Mazda 6, with bonus of Sirius sat radio that I didn't have to pay for. At MCO, I got a Nissan Altima for a 2-day local rental, which was a reasonable replacement really, but I didn't like it quite as much.