I have a version 1 and I *LOVE* it!
PC Magazine gushes about the Delphi XM Roady 2, an iPod-sized XM satellite radio receiver that fits easily into your car but can be just as easily removed and used elsewhere. Although the sound quality will be better if you hook up a wire to your stereo, the Roady2 comes with a built-in FM transmitter to make the connection as simple as possible. Of course, it won't do you much good if there aren't any stations on XM you like, but if you're already paying the $10 a month for the service, a pocket-sized all-in-one device will make a great option.
Read - Delphi XM Roady2 [PCMag]