While I agree with hookedon210s and deanyel on the general mistakes made and irresponsible actions taken afterwords by Mercedes, I would have to say that these CLIC clamps are far superior to anything that is driven by a fastener, especially for smaller diameter hoses and increasing fuel pressures.
I have owned three W124s and own two W210s so the head gaskets, timing covers, spring perches, MAFs, etc are not new to me. That is OK because all cars have some problems. What is not OK, actually disgusting, for me is the open-eye denials by Mercedes of these problems.
The CLIC clamps apply constant and even pressure on the hoses, unlike the static and uneven pressure by regular clamps.
These clamps are fairly cheap (less than $2 a piece from dealers).
The only issue are the pliers that are required to loosen and tighten these clamps because they are not widely available and if you do find them, they are not cheap.
However, here is a way to use a $1 pliers from the dollar store and work on these clamps.
(I saw these sometimes ago and saved to my computer but I cannot find the source now. Thanks to whoever originally posted these pictures.)