The decision of whether to jump ship from Sirius to XM is philosophical, perhaps religious.
The big pro of leaving Sirius for XM would be the ability of have a receiver in my car without additional components. That’s huge.
The cons are the fact that I’ve been with Sirius for two years, know their programming line, and my sister’s receiver is on my account as well. I’d have to replace my unit and both docks. But if I had one installed permanently in my car, I’d need another unit for home/work. On top of that, buying the XM receiver for my Civic right now is cost prohibitive.
The decision at the moment is to stay put. If, for no other reason, is that the merger of Sirius and XM could leave one type of unit out of date. By having an external unit, I am in a much better position regardless of how they merge/replace technologies. Besides, if I have the unit permanently installed in my car, I can’t go out and replace my unit with a newer one next year.
Having said that, I found the hardware on eBay for about $300.