Go down to your local dealer and get into one of the 128i's they have on the lot with standard audio. Spend some time playing with the settings, and listening to a favorite cd. Then do the same in a 335i with Logic7. My e90 with logic7 sounds similar, and possibly not as good, as my e82 with premium hifi, so it would be a good comparison.
It's really the only way you'll find out if it's worth it for you.
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