It's indispensable to us and I wouldn't want to be without it. We have one vehicle, our Ford Flex which is pretty much our everyday driver, with a built in Sirius radio and a ultra-premium sound system.
Our other Sirius radio is a Sirius Sportster 5 receiver which can be used on our Sirius Boombox or in either the motor home or Expedition with SiriusXM PowerConnect Vehicle Kits that are installed in both vehicles. I also have a SiriusXM Dock and Play Home Kit which allows me to connect the Sirius receiver to the sound system in my music studio. The Sirius Boombox is used to play quiet music at our astronomy club's star parties (usually Sirius Spa - 68) and also in our bedroom to mask the sound of my wife's BiPAP machine so I can sleep.
Our service on both receivers is Sirius Select and The Best of XM, I think currently 160 channels. The ANNUAL bill on one (paid in two installments) is $159.00. The annual bill on the second, and because we have two subscriptions, is $109.00 (also paid in two installments). It's such a valuable service to us, and well worth what we pay for it, that I don't mess with playing the, "I'm not gonna renew..." game and just let it renew automatically every year. Stories that they will renew without notification are just that...stories. I always get advance notification of pending renewals via email, postal mail (with the newest channel lineup list), and via messages on my Sirius receivers.