Larry - I disagree.
I spent about $10 more per front disk for the cross-drilled and I think it is well spent.
During the winter rains the difference in stopping in the wet is amazing. Pad life continues to be much longer than I had experienced without. Driving in the Sierras last summer with a full load of luggage and people, the brakes never even smelled hot.
I think the fronts only are the way to go unless one autocrosses or does a lot of competitive/ club driving since 80% +/- of all braking is done by the fronts.
Since the '91 E has the wheels that don't allow a lot of veiw into the brake area, the visual effect for my car is nill.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)