It is more an annoyance that they don't have a functional telephony system. It was a single day reservation on 6/22 where I went with Alamo instead of Hertz. However, Hertz has sent the day's rental, and then $100 each subsequent day for a deposit, to my credit card. It's all pending charges--true. However, it is annoying to have a single day's rental spawn multiple days of deposits on a car that wasn't even rented.
Oh--and this was a pure reservation with no fee. I attempted to cancel the Hertz reservation multiple times, and the Hertz site being what it is... yeah... we all know how that goes.