Sirius had the s50 which was discontinued cuz people hated how you couldn’t get live feed, and they’re realeasing the Stiletto in the next few months which gives you completely portable Sirius. XM however has had this technology for quite a while and they recently released the Pioneer Inno, Samsung Helix, and Samsung Nexus which are all pretty sick. XM seems to always come out with better units way before Sirius can release anything to compete.