Just got my XM direct unit installed and operational. Started testing out the XM functionality and MI has the best interface by far. Congrats and nice work.
I do have a bit of a problem though and after searching the forums haven't found anything like it so far. So the problem is:
When starting up XM Radio functionality or when changing channels the user interface becomes unresponsive for a long period of time. Sometimes the UI can lock indefinately. I use an IOGear USB to Serial adapter and run Win XP SP2. Made my own XM cable that is powered off of my ATX PS. Don't have any problems once the station is dialed in and stable.