First, it gives a clean line-in to the stero from the iPod, then it gives next and previous track as well as rewind and fastforward control on the stereo. Sure, you can buy a 2005 BMW and get the same deal as an option, but this is cheaper.
The manual also helps answer some basic questions about the xB stereo. For instance, all Toyota (1998 – 2005), Scion (2003-2005), and Isuzu (1998 – 2003) factory stereos apparently have the same connections. But, Toyotas require a cable adapter that’s only available from the dealer (part #08695-00370). With this in mind, I can probably get a cheaper audio-only input adapter. I went looking for such a solution before, but details about the Scion radio are scarce.
Then, for home-use, I can’t help but like the Bose SoundDock.
Related iPod stories at MaisonBisson:
Integration: In Car iPod, In Car iPod Take 2, iPod Integration Kits Proliferate For Home And Car, Saab, and PIE iPod Input Adapter.
Hacks, laughs, and background: iPod Hacks, iPod Giggles, What Does Proprietary Mean Anyway?