You're right about this board. Among all of the Mercedes Forums, this one is by far the most active, helpful, and knowledgeable.
I had some problems with my 93 300E at first, went through two Mercedes independent mechanics who both misdiagnosed my car, and it was this board that helped me work through the problems.
Ever since, I continue to check in everyday, and continue to learn everyday from other owner's problems.
I know see patterns emerge on common fault items, and try to point people in the right direction.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".