Originally Posted by jphughan
^ I agree with all of the above. But the main reason I use BT for short trips isn't because it's too much effort to connect the cable. It's because I very often forgot to get my phone out of the armrest again when I arrived. BT allows me to keep my phone in my pocket. I don't listen to music on my phone often enough that checking the armrest would have become a habit, so for the few times I do want music from my phone, as long as it's a short trip I'd rather enjoy the convenience at the cost of some audio fidelity. Longer trips, wired all the way -- unless it's a long FUN drive, in which case it's windows down and engine revs up.
So...my 64 GB iPhone 4s is now loaded with 50 GB of music (playlists), and resides permanently in the Snap-In Media Adapter. It has no cellular service anymore. It uses bluetooth to connect to the iRadar. The new iPhone 5 uses bluetooth for phone and SMS-on-iDrive....and on long trips, use the Lighting-USB-cable to keep it charged. This scenario works really well.
Someone suggested using the built-in BMW hard drive to store music, saying it's superior. Using that creates burdensome playlist modifications, no album art work, and a UI that is fairly fifteen years out of date.
If I didn't already have a iPhone 4s, I would have looked for a used iPhone 4 (so it fits in the Snap-In Media Adapter) that even could have been a bit scratched and dented -- all it does is ride in the armrest...doesn't have to look pretty.