We started using Hertz several years ago because they offered a guaranteed Ford Mustang (not the convertible version) at rate similar to an Intermediate.
For most, if not all, of our bookings we've managed to get a discount code of some kind. Also we've sometimes added a code, or a different code, to the reservation and had the cost further reduced - with the difference being credited to our credit card. Their fuel option is usually at a competitive price, in fact on our last trip it was the lowest price we saw. And we've never had them try to tack on all kinds of 'optional extras' as other rental companies do.
Gold Canopy is an excellent service. No queuing at rental counters, just walk to the board, look for your name and see where your car is parked, find it and drive away. We certainly miss it when we travel somewhere it isn't offered. In some locations they also offer Gold Choice, where they have an area with a selection of vehicles you can choose and drive away if you see something you prefer to the one allocated.
Unfortunately they have now stopped offering the guaranteed Mustang but we like the Gold Canopy service so much that we would pay (slightly) more to rent with them than another company.