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I really loved this GPS until it was time to update the maps. When I did, the GPS stated it was "unable to use" the new map and since I didn't backup my maps, there was no way to go back to the old one. Looking through the GPS forums, I discovered this is a problem with Tom Tom GPS devices ranging over the last couple of years. If you decide to purchase the xxl 540, be sure to backup your maps right out of the box. There is a rather convoluted fix for this I found on the web that involves deleting the maps from both your GPS device and computer and then reinstalling from scratch.It did work for me, but before you try it, I would backup your maps to a second computer.