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I chose a portable unit Garmin 2610 that I can take with me from car to car. Its especially useful when on trips (business or pleasure) b/c most rental cars don't offer NAV. My wife uses it every now and then, but its primarily my toy.
I think its better than OEM since it has touchscreen, has more points-of-interests, and the portability issues above. Hopefully, my next car will have a good OEM NAV with XM Traffic built-in.
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