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Title: Great GPS... XM Antenna a little expensive!
Review: Just bought the 550 for my bike and it's great. It comes with everything you need to use it in your car/truck AND on your motorcycle. It navigates and recalculates very quickly and so far is very accurate.It's also obvious that Garmin put some thought into the engineering of this unit. The mounts are sturdy and it's easy to use.My only complaint is the cost of the XM antenna... it's over $200. You can buy an XM radio for less than that, so why not just put an audio input jack on the GPS and allow me to listen to my own MP3 player and/or XM radio through it?
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