I have the Fiscon kit as well, pure class!!
Why is it class?
I meant its really good, something may have been lost in my Northern Irish teminology there.
Well, if you pair the Fiscon with the RNS 510 you have full control of your phone book and also all phone functions via the touch screen. It is completely OEM look and functions brilliantly. The quality and reliability of the bluetooth connection is also excellent.
If you have the Highline (which I dont) you can also read SMS messages (depending on your phone) in the display. You can also stream bluetooth audio via the Fiscon system should you desire to do so.