I bought my slotted rotors(front and back)
here.

http://www.raceshopper.com/sp_mercedes.shtml

They have only been on my 84 wagen for about a
month and a half,which is not enough to make
any assessment on which is better. But to me
having the piece of mind that my brakes will
still work when traversing flooded highways
is more important than price.
(and here in N. New Jersey it happens alot).
Plus when going down steep long hills,you're
less likely to have brake fade.


Louis.