We rented with Hertz and got a flat tire and a rock hit our car. We assumed AmEx covered car insurance, but they do NOT. Ireland is an excluded country. We paid the CDW ($90eu/week) for our $94eu/week vehicle, which basically means you pay the deducible, and ours was $2500eu ($3,171usd), and that's what they charged us when we checked the car in.
My husband did great driving with the stick shift, but with the narrow road, there was a huge rock in our lane, and with an oncoming car, he could not avoid it. it hit our tire and 2 doors. Urgh.
We'll try working with Hertz to reduce it, but we are on the hook. We still had an awesome trip and probably won't do it any different, but I'm just sick about paying for what amounts to another trip to Ireland.