My husband and I purchased the Garmin StreetPilot c550 as a present to each other for Christmas last year.  We could not be more pleased.  It has been accurate on each trip and even helped us find a quicker route to a destination we had been traveling to for years.  It is so helpful to mention the name of streets unlike some GPS systems that only give you directions to turn 400 ft, 800 ft, etc.  I would highly recommend this product.  Updates are quick and easy to obtain.  We plan to purchase another Garmin in the near future for our other car.

Also, the window mount is good, but we have found...