We had a really BAD experience with XM Sirius, so my opinion may be a bit biased. We had XM for several years, starting with a portable unit (remember the MyFi?) that I bought for DH many years ago. To that, we added service to one of our vehicles...and continued to renew annually for several years. When the XM/Sirius merger happened, we started to notice a LOT more commercials on what originally was touted as being "commercial-free" radio. We decided at that point, to not renew our service. When the renewal letter arrived in the mail, we just ignored it and threw it in the trash...thinking that by simply not paying, our service would just be cut-off and that would be that. Ummm...not quite. XM continued to renew our service without our consent (apparently they put us on an automatic renewal plan that we NEVER agreed to). When a bill for $30 arrived, we refused to pay it. Shortly after that, we started to get persistent phone calls from a suspicious number. I Googled the number and discovered that the calls were coming from a collection agency on the behalf of XM Radio. When I finally answered one of the calls, I ended up speaking to a VERY nasty and rude person from the collection agency. I was told to call XM directly, to talk with them. After explaining to the XM rep, that we had decided not to renew and were not aware of the fact that they had renewed our service via automatic renewal, we were promptly told by the rep "that's not our problem, you still have to pay the $30". In order to save our credit rating, we reluctantly wrote a check for the $30 and included a note to XM telling them to "never contact us again because we will never do business with them ever". They still send us crap all the time and I just immediately toss it in the trash. I'm sure that some folks have had nothing but great things to say about XM....but in our case, I want nothing to do with them. Just be educated and forewarned of their tactics and make sure you read ALL the fine print before entering a contract with them!