i got the bsw speaker upgrade,which replaces the 8 tweeters and mids (not the subs) of the stock hifi system.it sounds great.the sound has been transformed from mud to music,it is a lot better than hifi. very clear,fine quality.the speakers appear very well made,and my mechanic friend said installation was super easy.
it won't blow you away,and is not the highest level of audiophile sound,but it doesn't claim to be and i would highly recommend it,especially for the less than $500 i got it for.i'll probably do the amp when it comes out.
~ 2OO8 E90 M3 /// INTERLAGOS BLUE w/BAMBOO BEIGE, CARBON LEATHER / 6MT / 19" 220M FORGED WHEELS / PREMIUM / MOONROOF / IPOD / BSW SPEAKERS ~
~EVERYTHING IN MODERATION,INCLUDING MODERATION ~