Larry,
I tried several working (amazingly) GPS models that one local store had and I found that some (Sony in particular) had a very slow and confusing interface. That was a year or more back (so things may have changed) but I strongly suggest that you try to check a working one out for yourself and see what YOU think. How you enter addresses and find destinations is just as important as how the unit provides the driving directions.
I have used the Herz Neverlost system many times when I rent cars from them. It is very easy to use and has smart predictive completion of the input information. They are Magellan units but I have also tried and quite liked the Garmin unit that Jules uses.
I love Sony products for quality and technical performance but I despise their software and human interface almost universally.
Good luck!
Mark
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