I neep help in deciding which one to order, I have an iPhone 3G and will probably upgrade to a 3Gs or even 4G next year or so. I have an e53 2006 with the Business Radio (CD, no nav), I have the bluetooth module, I don't have the CD charger, I have the DSP but it seems that I don't need any digital converter since I also have the 6 pins and the 3 pins connectors avalable in the trunk.

My criteria are:

1) Sound quality
2) Stability of the product (no surprise)
3) Usability (can use both the Steering or the iPhone interface, navigation of the tracks, charging the iPhone, compatible with my bluetooth integration)
4) Forward compatibility with future iPhone version
5) Availability in NA

Any hands on experience to share?