Initially I was not interested since the lifetime subscriptions are tied to the radio. They told me that was the case however you are allowed three transfers. I had my current radio since 2005 and it was always reliable never gave me a problem. I figured if all my radio's lasted half as long I would still make out in the long run so I decided to go with it.
Well right after my third and final installment on the lifetime subscription my radio fails. I call Sirius and the customer service rep works with me for a few minutes, sends a signal and the radio comes back, I figure all is well. The same thing happens the next day and a different rep tells me I need a new radio, there's nothing they can do. I send an email to Sirius letting them know that I thought the rep should have at least tried to help and not write off the radio without any troubleshooting. I get an email back with an apology and a side note saying that if it's a Sirius branded radio and it's under warranty that there would be no transfer fee. I replied back inquiring about this "transfer fee". I get a response back saying that there is a 75.00 transfer fee plus a 15.00 activation fee!
So, with the lifetime subscription, that's not really lifetime, there are costs associate with the transfers. There was never any mention of additional fees in any of my conversations with Sirius during the whole process of setting up the lifetime subscription. I was left with the impression that I could transfer receiver's 3 times, this is what made this subscription attractive.