My 2011 e92 Sound System:...
I was skeptical after reading all the posts of the shitty stock stereo system, with no bass and bad treble.
I don't know if they changed any specs on the system (I heard they are using Harmon Kardon for the premium now), but I have the standard and it sounds great! Great mid-range bass, good low and high ranges, and treble is just fine. Turn it up, and it sounds crisp and deep.
Would love to meet up with a 2010 owner to compare. I was ready to take it straight to the aftermarket audio shop, but there is absolutely NO NEED!
I'm just sayin, all i'm sayin.
My M3 is for sale here