I wanted to share my experience so that others do not get caught in a similar situation. I booked a car hire thru Irishtourism.com with "Irish Car Rental". When I arrived at the rental counter with confirmation in hand I was told they could not honor the reservation as they were out of cars. After some urging with a manager, they agreed to try to reassign my reservation with another company. The other companies viewed this as a walk-up, and we quoting rates 2-3 times what I originally booked with "Irish Rental Car". I ended up paying 2.5 times more to get a smaller car as the other company would not honor the original contract. When trying to resolve this after the trip - "Irishtourism.com" has distanced themselves from "Irish Car" and "Irish Car" says a reservation is not a guarantee. I have subsequently found out that "Irish Car" is a very small company that brokers reservations to "Sixt Rental Car" and "Dollar Rental Car", so they do not appear to have the inventory to handle all of thier bookings. Would advise folks to book DIRECTLY with reputable large inventory car hire companies like Hertz, Avis etc. and to AVOID "Irish Rental Car". Hopes this helps others understand they "players" in the growing and competitive car hire business in Ireland.