Sat Nav on 307

Hi folks i am looking at buying a new 307 DTurbo with the colour Sat Nav in it but i have a few questions i would like to ask first.

1. Does anybody have it at the moment and what's it like ?
2. Is it difficult to see the display?
3. The information i have about it is very brief, even the dealers don't have one in there demo cars, where can i get more info from?
4. One website said something about using a mobile phone with the sat nav how does that work?

Thanks for your help guys Jas