Summary: I have a TomTom GO 910, that still works great and got XXL 550TM< hoping for similar results. They are very different. Although GO 910 is much older, it still faster, and the menu was easier to user then the new model.
Summary: Just bought this a few weeks ago, so far it has worked like advertised. I like the user map corrections, and the lifetime traffic and maps. Set up was easy, downloaded new maps through TomTom at home with no issues, first update did take around half an hour to complete.