I've had my Garmin NUVI 350 for about a year and love it. It is a little larger than a deck of cards. There's a NUVI 360 available that can be synced with a Bluetooth phone and a NUVI 660 that has a larger screen and the ability to transmit the audible directions via a RF signal to specific radio stations, I believe.
It is tough if not impossible to hear the audible directions with the top down, but that isn't a major problem once you are familiar with the display. I can use it just fine by looking at the display without any audio, and sometimes choose to just listen to the audible directions and not use the display when the top is up or in my other vehicle.
From what I've read, the NavTech maps on the Garmins, and other brands, are better in the US and the TeleAtlas maps on the TomTom models are better for Europe.
My NUVI 350 will operate for about 2 hours on battery power. For most uses this is sufficient for me so I don't have to drag around the power port cord. It can also be charged via AC power.
The small size makes it easy to throw in a carry-on bag during air travel.
I bought mine from walmart.com who had the best prices a year or so ago. I actually found some better prices at other online stores, but I wasn't familiar with them and felt more comfortable buying from a larger, known store.
Hope this helps.
ddb
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