I just finished partially installing the BSW kit (I still have to do the 4 rear side speakers).
OMG night and day difference. No more crazy EQ settings since it sounds better flat now, although I do prefer +2 on the bass. I also prefer the sound stage with Logic 7 Music turned on (I have the non-IDrive dash).
I'm playing 320k mp3's off a thumb drive and everything sounds amazing. The only thing I can compare it to are my reference Alesis studio monitors. The harshness is gone and the clarity is amazing, to the point that I could hear breathing in tracks I never noticed before.
Tomorrow I'll finish the install and see if it can get any better than it already is. A+ job guys, awesome kit.
