I've had techs tell me it was the worst they ever built (until the .9 surpassed it). I've always thought it was a candidate for the worst transmission ever built by anyone. There have multiple stories on forums over the years of individuals dealerships having done overhauls/major work on over 5,000 of them - at a single dealership, and that was years ago. No doubt it got better over the years but the 722.6 was a major blow to Mercedes' reputation, right up there with wiring harness and ASR.