Thank you for the feedback, drbenz. Glad you like the car!
The presence of the SAT button on COMAND doesn't necessarily mean it has the SIRIUS equipment installed. If you press SAT, and get feedback saying "Sirius (or SAT) not installed" or something to that effect, then you'd have to add it. If it is present, but not activated, you should get a message to that effect - then you contact Sirius for a subscription, and once activated, you are in business. I don't have the Mercedes bulletin for installing the unit in the S-Class, but a contributor posted a link to one for the W171 at
http://www.benzworld.org/forums/audi...ll-2005-a.html - the installation shouldn't be frightfully different, and would be especially easy if you have the prewiring (the connectors would be on the left side of your trunk, inside the liner, if you do).
Frankly, I'm a strong advocate of keeping my Benz OE, if at all possible - it wasn't possible for my iPod integration, but it is for phones. See
http://www.benzworld.org/forums/audi...ades-plug.html, especially permalinks 1, 5, and 6. There are other solutions available, especially through Argos and Mobridge, but I have no experience with them.