EMOVIS have used it both in France for years and latterly in Spain, definitely the way to go. I am a map person, but if it's your first time use a sat nav with a pre-planned route and remember to ensure speed cameras turned off for France. Fuel on a sunday if driving away from Autoroutes can be hard to find and it's usually dispensed from an auto pump. If relying on credit card make sure you have a Mastercard, ideally one that doesn't charge transaction fees for foreign currency purchases. Good news, the first and only positive thing I have heard about Brexit is that the French loose access to the UK DVLA database. So no postal fines. I am sure our French friends and expats on Talk Morgan will add comment