I have my brother's XM Helix radio on my XM sub. I added the Best of SIRIUS to his radio the other night. It seems to work fine. It will raise the quarterly price of his radio from $39 to $51. Apparently, the Best of SIRIUS option is available for my old XM Roady2 as well. The quarterly price for my radio is only $21. If I add the Best of SIRIUS with multi-radio discount, it would only go to $33 per quarter. At first, I was thinking this is a good deal and I could cancel my SIRIUS sub. But two things stopped me from doing it. First, I can't get EWTN on XM. EWTN on SIRIUS is sooo much better than on shortwave. I'd miss First Wave, Spirit and The Pulse but I could live without them if necessary. Secondly, my father's Brix Streamer is on my SIRIUS sub. Ideally, I would much rather add Best of XM (if it included MLB) to my Brix Streamer, but when I log into my SIRIUS account, it tells me that the Best of XM and other a la carte packages are not compatible with my current radio. If the Best of SIRIUS is compatible with my old XM Roady2, then why is Best of XM not compatible with my Brix Streamer, a much better radio in my opinion? Is this just SIRIUS trying to get me to buy a new radio?