I'm thinking that if it is on-demand, it's more like on-demand-ish if you're in your car. I can picture them synching like PDA's used to. When you're near your wifi hot-spot, you can tell it to update your channels, but when you're in your car or away from the wi-fi, you can't customize anything, just listen to what you've created. Obviously, when you're on your computer, smart-phone, iPad, whatever, you get the whole show. Somebody around here used to look up what patents and FCC approvals Sirius had filed for. We should prolly keep our eyes open to see if they are registering anything. I'm ready for new toys!