im pretty sure ford use the denso system?. My wife has a lexus rx330 with a denso system and we can interchange the map disk between her car and a ford with no problems.
If it is a denso, then i reckon its great. Ive used many many GPS systems, (tomtom, garmin, vdo-dayton etc) and the touchscreen denso is second only to the tomtom, and IMHO the best incar system around.
Dave