Hi there,
In general the Nuvi units are somewhat less resistant to vibration and not as shock proof as the Zumo, also the cradle is not as robust.
That said, if you are careful (and don't use it off-road or in rain a lot) The hi-tech automotive range of units (such as the Nuvi 700 series) are excellent.
One thing to bear in mind though is that the software updates for the Zumo will likely be bike specific, so if new software features are introduced, you might miss them on the Nuvi then.
Otherwise a good choice if you as me and many of 700 series units come with TMC built in which the Zumo does not have.
David
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