Sat in the G30 today, and tried the Mode button on the steering wheel, but to my disbelief you couldn't switch from Radio to Music collection/USB with just one push.
I had to push several times to scroll through, in my case here in Europe, DAB, FM and AM to get to the Music collection/USB. And i couldn't push the Mode button fast either, had to wait a bit between each mode.
In my F10 it's one quick push on Mode to switch between Radio and Music.
How's other peoples experience with this??