In reply to snoop6060:
Seems quite variable, depending on the agent you get.
My sister had a run-in with Hertz when she hired a car in Australia 18 months ago and hit a kangaroo. She'd asked for full insurance, but the agent had mucked up and not added it on, leaving them to take quite a large sum off her credit card for the damage. She had the card company stop the payment and it took months to get resolved.
They were also hopeless about sending anyone out to check the damage and arrange a replacement vehicle, etc, causing quite a delay in her trip.
Double annoying, as she works for Enterprise (we get a family rate with them), but they don't have any operation in Australia.
We were also out there and hired from Hertz, as one of the few places that had offices where we wanted to hire and drop off - I had excess insurance from a UK company, but fortunately didn't need to test it.
In one office, the agent decided my baby daughter was so cute she wouldn't charge us for a car seat for her