Hertz is pretty good about service.
In 07 we rented a puick and they upgraded us to a new deville northstar - that was nice until the speed limiter cut in - went about 1/4 mile before the engine ran again.
The starter went out on a sunday night and we were stranded at a friends house. GM mobile came out and changed the starter and when we turned it in they gave us a one day refund.
About to rent my 3rd hertz. Put 2200 miles on the caddie, 4600 on a 13 monte carlo and headed to south dakota in a ATS in a couple of weeks.
No worries travel and the better mileage, about 10 more per gal, than our cars covers a lot of the rental fee. LOL