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I also have the base stereo, and I was pleasantly surprised when I first tried it. (To tell you the truth, I don't use it that much because the engine makes such sweet music.)
I agree with comments that base BMW systems used to be lacking - I have a 2000 328i with the base unit offered at the time, and it's not very good at all - very thin bass.
I don't feel that way about the e90 M3 base unit. The bass is good and solid, although you may want something more if you want to rattle your fillings. The unit sounds great to me - I don't need anything more. I used to consider myself an audiophile, but I probably did too much damage to my hearing cranking up Freebird, Springsteen and Led Zep in the '70's. I haven't heard the upgraded system, but I can't imagine it's a quantum leap better than the base unit.
(I also have a 2007 X3 with the base unit, and it sounds pretty good, and the M3 is better.)
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