I can't believe it - I just managed to get my wife's 8520 Curve to synch with the troublesome Premium Bluetooth kit !!
Procedure as follows:
1, Set Car to search for bluetooth devices
2, Set phone to listen for bluetooth devices
3, Car finds phone (displays name on dash MFD) while phone is still going through listen cycle
4, Press OK on RH MF steering control - triggers an exchange between car and phone - phone asks for a PIN
5, PIN to use is displayed on Car MFD - 16 digits
6, Enter PIN into phone and press enter
7, Phone finally connects fully and shows a message enabling you to disconnect from Car - phone now redundant, all functions controlled from car, can put phone in pocket/centre console/wherever
8, Touchscreen display now kicks into life and message comes up showing that address book has loaded (I might have pressed the phone button on the touchscreen display - can't remember)
9, While I was doing this, a text arrived and I was notified on the Dash MFD, and was also able to read the message!
10, When you want to disconnect, just hit enter on the prompt showing on the phone
11, Reconnection is automatic from now on when you get in the car with the phone
At last!! And a lot better than forking out more money for the newer unit ...
The wife was very pleased ... especially about being able to read texts from her mates on the display ...

Dave