My wife and I always take our Garmin Nuvi with us whenever we have to rent a car on our vacations. We have been to Europe on two prior different occasions and on those two occasions we used regular paper maps. We just got back from vacationing in Spain and Portugal this month and before we left we purchased these Garmin Maps to try our Garmin Nuvi. We did take paper maps as a back up. I am happy to say, we didn't need our paper maps. The Spain and Portugal maps were not only a time saver and precise, but they were easy to use. They even made driving in small town roads really easy. We were able to find all of the towns we wanted to visit and were able to find major hotels, landmarks, and attractions that we were looking for, just remember that if you are looking for a list of similar items, such as "beaches". For example, in Portugal after realizing that you have to type in the word "Praia" all of the beaches we wanted to visit were listed. We made the mistake of typing in the name of the beach like Selama, but were taken to the actual town center and not the parking lot for the beach. Once we figured this out, getting directly to the beach was a breeze.
A second tip I would offer when renting a car in either country, is to use the your Garmin's "Where Am I" feature before driving off with your car from the rental car parking lot. This will give you a chance to "save" that actual location and make it easier to find when you return your rental car to the same location. We did this and I am glad we did because there were no signs directing you to the rental parking lot at the Seville train station were we returned our car.
I was really pleased with this purchase and highly recommend it for anyone planning to rent a car in either country.