I know that BSCARLETT who is actually on this thread had a Dice iPod Integratation installed in his X5 and had a few issues with some of the BMW Electronics malfunctioning.
You can read here what happened with the DICE...
http://www.xoutpost.com/x5-e53-forum/...light=invision
Feel free to email him on here because he has both my system and the DICE system in his car. I have a relationship with every BMW dealer in the country and sell my product to over 45% of the dealers in North America.
-Lawrence