From the research I've been doing, it does appear that HB3 is correct. You can purchase a portable unit that can be interchangeably used in either your car, or in your home. One device can even play via WiFi.
It looks as if the SiriusXM Edge, and SiriusXM Lynx are the two most current portable models on the market which will serve this function (the prices are far better on Amazon).
SiriusXm Lynx
SiriusXM Edge
You can buy a home kit, as well as a car kit for both units. This helps with mounting and power supply. Boombox speaker docks for the home are also available.
From what I have read, the key issue with a home kit is reception. An antenna is pretty much required. Being radio junkies, I can't imagine the antenna aspect should be too complicated for any of us.
Other than antenna issues in both the car and home (I suspect a professional installation in the car will make a big difference if it is affordable. If not, do plenty of research. It's out there and apparently makes all the difference in the world if you don't try to DIY as a rush job when it comes to your car), it looks as if the only other typical problems with these radios is:
A) Buying an XM only version - which will leave your S.O.L. when it comes to the new Dark Matter program.
B) These radios seem to crap out after a few years. They aren't built like old Zenith radios to say the least.
C) SiriusXM customer service is rumored to be absolutely awful compared to industry standards.