I absolutely love the c340 . I do not understand some of the critic of this because mine be exactly what I would hope for and expect . the detour function be awsome . no glare issue . we 'll see how it endure , but out of the box it work as advertise . a few month later , it have take trip from tn to MI to CA to Vancouver and back . it help bypass problem area and find great place to eat\/stay as well as point of interest along the way . signal be always strong , as far as I could tell . there may be more highspeed feature other need out there ; but for the money and simplify ease , this be perfect .