I have been using a GXM 30 with my Garmin 2739 for over 2 years now.I am very pleased.I use if for music as well as subscribing to the traffic and weather services from XM.I take the unit wherever I go.The 2730 goes from car to car as well as two motorcycles.The GXM I only use in the cars as I have hard wired a Delphi Sky-Fi II mounting bracket onto both bikes and take the head unit with me as I need it.For those of you who are thinking about buying a car dealer navigation system in the car as well as XM - don't wast your money.The Garmin is a whole lot less (I paid $181 for a refurbished unit), it is more easily updated and for less than the dealer systems, and it is portable.OK, it is not as cosmetically appealing as a in dash screen but I can live with that and the $2000 I saved.I agree with the previous poster, the first person should have researched the product.His complaint is not a valid one.Click Here to see more reviews about: Garmin GXM 30 Antenna NavTraffic and XM Satellite Radio reception for your Garmin navigation system
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