I haven't done it in the USA, but purchased one in Australia a few years ago
Couldn't have been happier wiith the process - no car salesman trying to push cars and extras, just went in and picked up a pricelist
Purchased the vehicle which had done 33,000 Km for a price I was happy with and it has been running perfectly for 3 years
Would have no hesitation about buying a vehicle from Hertz