Questions about adding Bluetooth/aux adapter for my RNS-E
 

Hi all! So I drive a 2006 Audi a4 B7 and it has the RNS-E unit. I was looking to add Bluetooth and aux functionality to it and I found this item on eBay
Bluetooth BT USB SD HC MP3 CD Changer Aux in Adapter Audi RNS E Rnse | eBay

If I were to purchase this adapter, would it truly be plug and play like the listing says or is there more to it? From what I've read I'll lose my cd changer functionality but will my factory Satellite radio still function? Also, would this function with the rnse's blue tooth calling interface or would it act as a stand alone? Thanks in advance guys!