We have over 12 years of experience using various models of Tom Tom GPS units. Even with the best of care, these units have a history of failure after 3 years. They develop power issues or the battery " goes flat". Despite map upgrades, the fastest route option fails in most city environs. A main street route with stop lights every other block is never an efficient travel route compared to perimeter routes in city navigation plans.A company's history of deficiencies may influence your decision when purchasing a unit which best suits your needs.