I've had a Sirius Sportster in my vehicle(s) long before I had XM. I purchased several vehicle docks and can place the receiver in the one I happen to be using. Last year, I got a vehicle that came with XM. The beauty of an integrated system was undeniable, plus I liked the programming a little better than Sirius. Now that the 2 companies merged, does anyone know if they willl offer the multi-receiver discount to a user that has both Sirius and XM? I really need to hang onto the portable Sportster.