I received this in my email from my BMW service dept. What are the shortcomings of this solution? Anyone heard of it?

"Get Connected This Holiday Season

With The New BMW IPOD Adapter

For 3 Series (E46)-Z4-X3-X5

Installed For Only $317.98

Connects your IPOD to your BMW's Sound System

Utilizes Steering Wheel Audio Controls

Charges IPod Internal Battery When Vehicle is Running

A Great Holiday Gift Idea!!!!!!"

Present this email and Save 10% off the cost of Parts!