i think you'll be happy with it. i use my MyFi a lot w/ my boombox when i'm at the beach, camping, etc. units w/ docks are definitely the way to go. just get a home and car dock for it, and you're set.

if you ever need accessories for your XM unit, i'd recommend www.myradiostore.com. i've gotten a lot of stuff from them. good prices and fast shipping.