I haven't tried the assymetricals, I know a few guys with M3's have and prefered the PS2's, same with some of the 911 owners, but the Audi guys and the Merc owner I know who has used them have said they seem as good if not better.
Now I have PS2's on the E320 I will stick with them, to be honest some FK452's would have been more than adequate on this car, but got these with 7mm on for £400 on some 17" alshain wheels so it was a no brainer.