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Really works like it says
I have a TomTom rider that I replaced with the Zumo 550, just like night and day. I can preplan routes, and create routes on the fly. I hard wired it into my Ultra Classic using a J&M harness, instead of Blueooth. Works great, a better lock would be great. The screen is brighter and easier to read. I would buy it again, and did. I gave one to my girlfriend.

best product on market
First of all, don't buy elsewhere...promises of lower prices are simply NYC scam jobs...

The Zumo allows you to integrate navi, phone, and SDHC music with basically no effort...

The product is awesome in every way...waterproof for a motorcycle...

I coulpled this with a scala rider 2 and it works great...a bit hard to hear at highway speeds but no complaint...I'm very happy with the zumo...you will be too!

Advice: Get it hardwired to your bike...get Garmin 'bolt' so bracket cannot be taken (it's security for the bracket)

Zumo 550 - Great for Bikes and Cars
I purchased my second Zumo 550, after my original was stolen from a rental car. The unit performs exceptionally well, and is very easy to use and understand.
I use it on my BMW R1200GS and also in my car. The unit ships with all the stuff you need to mount it on the bike and in the car. There are maps available from Mad Maps which feature some nice motorcycle routes in a variety of different US states.
I am a Mac user as well, and the only complaint I have so far with Garmin is that they don't seem to offer as much support for mapping software on a Mac as they do on a PC. Other than that I really think the unit is great. I give the Zumo a 5-star rating!

Zumo 550 is a Great GPS
Listening to all of the complaints about the Zumo can, at times, be quite comical. "It doesn't have bluetooth stereo at 500 watts of power over my cell phone," etc, etc. I bought the unit six months ago and mounted it on a Harley Ultra Classic and then promptly left on a 4,500 mile trip. I found the thing to be highly reliable and remarkable in the amount of data available for recall or review. Once you get used to using the search features, it's like having an electronic Yellow Pages at your disposal. The only thing it couldn't find was my wife when she got loose in Macy's. Only occasionally did the thing route me along a path that I wouldn't have chosen otherwise. But, I simply ignored it on those occasions and struck out on my own. There is a tendency to forget that I chose how the thing calculates a route; shortest travel distance or faster travel time. In that regard, the unit is rarely off track--it does what you ask it to do. Only once have I encountered a situation where it asked me to turn on a road that did not exist. I just ignored the direction and it recalculated, sending me on the correct path. It will not, however, play 45 RPM or LP records. Who cares if the speaker isn't loud enough, it can't be heard on a motorcycle anyway. Remember that this is a GPS unit designed to guide you from point A to point B, with a minimum of fuss and confusion. In that regard, the unit performs remarkably well and should provide years of dependable service. I've used the Zumo in the Middle East and in Eastern Europe with equal success and have experienced no difficulties at all. If your goal is to purchase a mapping system that will take you from point A to point B, you will be well pleased. If you want an entertainment center, then avoid the Zumo and go visit a Panasonic electronics dealer.

The zumo is great
I just did a coast to coast ride on a vespa. the zumo 550 worked really, really well.