Summary: I've been using this GPS for almost two years. It works well enough, but it appears that bankrupt Delphi will not be supplying map updates. I am a road warrior, and I am already running into problems where the maps are not accurate, or roads are missing. Also, it won't save a destination unless you are on a road, so if you are in a parking lot, down a long driveway, etc, you have to go back to the road to save the location.
Summary: I bought this GPS around Christmas - 2007 for $150. It lists for $399. I had originally ordered another GPS but the store, where I made my purchase, lost my original order. I agreed to accept the Delphi NAV-300 because it was supposedly of equal or greater value. The good, the NAV-300 does what it is supposed to do. Punch in a destination and it gets you there, as long as the destination is on the GPS map.