I'm sick and tired of uncomfortable bluetooth earpieces that only hold a charge for sol long.  So I'm in the market for an all in one device that can link handsfree calling with the ipod side of the iPhone AND include turn by turn instructions from Tom Tom app over the car stereo.

From what I can see there are two clear options IO Play (http://www.ioplay.co.uk) and Parrot Mki9000 series (http://www.parrot.com/uk/products/for-ipod-and-iphone).  It is not clear if they integrate iPhone Satnav apps like TomTom or Sygic - allowing for clear turn by turn instructions to interrupt music and be played over the speakers.

Does anyone have experience with these products and suggestions?

Cheers