I'm thinking about adding an XM radio to the bike and debating on which unit to buy. I'm leaning more to the Delphi XM SKYFi because it can be easily moved from vehicle to vehicle using the Vehicle Adapter Kit. The SKYFi can even go into the house using the Home Adapter Kit or the SKYFi Audio System boombox. Looking at XM's website they only show a cassette adapter as an input into the vehicles factory radio. I know several are running this unit on your GL1800's, is there another way to hook it in? Will it interface with the Aux input in the left fairing pocket? I would like to hear the pro's & con's of all XM models. Thanks!