Exactly. It's not noticeable at high speeds if I really got on the brakes--only when rolling up to a red light at low speeds. I get about 18,000 miles per set of front pads, so I change rotors about every other pad change. With the new rotors installed, it does go away for about 20 miles, but it always comes right back. I always buy the rotors and pads from the dealer and I don't think I would have gotten five bad sets. As for the condition of the old rotors, I never checked to see if they were warped. They looked okay-just worn where you would expect.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles