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After owning various Nuvi units (wife had a 200, I had a 260) AND a Zumo 550 on the bike, I can say without a doubt I prefer the Zumo on the bike and the Nuvi's in the cars. Wife just traded her Zumo 550 to a friend of mine for a new 265WT. He wanted the Zumo for his new Ultra, and she wanted to get back to the Nuvi form factor.
I just bought a Nuvi 760 for my car so I don't have to transfer the Zumo back/forth anymore.
Not sure about the Zumo 660 since they don't come out till April. I'll have a look/see at one in person once they're available. I do like the form factor of the Nuvi's over the Zumo 450/550, and if the 660 retains the viewability in direct sunlight like the current Zumo models, I may get one to try out.
I just bought the Nuvi 550. The 299 pricetag was much more reasonable to me than the 700 or so for the Zumo. The Nuvi is waterproof and vibration proof. What it lacks is all of the audio output, bluetooth, satellite radio, etc, which I don't intend to use anyway.
Walmart has the Nuvi 760 for ~$220 (online purchase only). I jumped on one when I saw them at that price.
Audio out, FM Transmitter (so you don't HAVE to use the 3.5mm audio out port), Bluetooth, SD card slot, etc.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.