I have Logic 7 in my e90. It is certainly a lot nicer than the standard stereo in the e90/e92 (328i doesn't have Logic 7 standard).
Basically, it adds an EQ and a few spacial surround sound modes. I leave mine on Concert Hall, and brighten the highs and extreme lows a bit, and call it a day.
I'll be getting the upgraded audio option on my 1er too, as well as Sirius, HD Radio, and Ipod integration.
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