I've used a Magellan Road Mate 700 before. Pretty nice unit and relatively straight forward to set up and use. Also, it give you voice commands which are very easy to hear and follow even if you have all your windows down driving on a busy street.
There are some major drawbacks to the unit however. First of all, it is not batter powered so you can't use it outside of your vehicle (in case you want to walk around instead of driving). Another HUGE problem with the unit is that it sometimes would lose the signal from the satelite so it couldn't figure out where you were exactly which can be a big problem when you are driving.
Overall, I would give the unit a 7/10.
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32"x32"x20" Cube-ish tank
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