I bought a Garmin Nuvi 500 which also required an aftermarket handlebar mount and a 'cigar lighter'-type power supply (got the bike shop to fit that). The Nuvi 500 is quite small so it doesn't obscure the speedo or tach. It's easy to read and the touch screen face is good, even with gloves on.
I like it. I bought the Garmin so I could take advantage of the free and regularly updated maps provided by NZ Open GPS Project. Their forum has also been very helpful in sorting a few problems I've had.
I like it because I can map out a ride in advance. I cross-reference google earth and the garmin software (Basecamp) to explore new roads and routes. Then I upload the chosen route from Basecamp to the Nuvi and its ready to go.
You don't need the voice as the GPS has arrows and other graphic, on-screen instructions. You can run it as a map or with arrows like a road book.
There's plenty of time to look at the instructions safely. Obviously you use a bit of common sense and don't go bowling through busy intersections with your face glued to the screen. It usually takes no more time to check the route instructions than it does to glance at your speedo.
Yes you can have a map book but there is a lot more pissing about with one and they are more distracting while riding because the route is much smaller. The bonus with a map book is they are much cheaper.
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