My first was an Airware (still active).
My wife got a second Airware (still active)
When the headphone jack on my Airware went wonky, I got a Tao (still active).
XM Canada had a great deal on RoadyXTs so I got one for me and my dad. They came with 3 months free service. They then gave me a very good renewal rate for both. I used it in my old car. When we replaced the car that became inactive.
I have integrated XM radio in my new car. I tacked on the end of my remaining XM Canada sub onto the end of the 3 month free trial. Due to several screwups with that process, I wound up with 1 year taked on at the price of 7 months. (still active).
I have a Timex XM Clock Radio which has never been activated. I use it to listen to my XM and Sirius radios in my bedroom/office.
I got a XM Commander or some such cheap XM radio for its antenna. It was cheaper than the replacement antenna at the time. It has never been activated.