The Tom Tom One provides a great value for budget minded GPS consumer.

A preloaded United States of America map is provided and has proven fairly accurate for the few different states I've used it in.  However, on a few occasions the Maps have not been updated for new road construction and the device becomes confused.  Fortunately it was clear the device was not providing proper direction, and so continuing to drive eventually lead to the device recognizing the proper turns  (it located the areas not affected by new construction).

The satelites are fairly stable once the Tom Tom finds one. ...