Ted,
Installed the BlueBus into my e39 M5.
Great case, just fyi the clearance for the coax digital was tight. It may have been better to connect all the cables, and then fully tighten down the box screws.
Audio works great using the digital input, which is huge over the CD changer or cassette tape.
A few questions/issues:

1. What's the shortcut to the BlueBus menu? With nav, I cycle the inputs, and once on Bluetooth/BlueBus, I press the right scroll wheel.
2. The settings menu inactivity timer is too short, 3 seconds to select, or it drops back to dashboard. Once time in the settings, it didn't time out when moving through menus, but all the other times it's a race to make a selection
3. The built in mic in car isn't working. I can hear audio from calls, but cannot send audio during calls or to Siri.

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'05 X5 4.8is, '02 M5, '01 740iL, '10 335i. (ex. '00 328i, '99 M3 cab, '95 740i, '93 325is, '86 325).