I had the evaporator replaced in my 300d just a few months ago - I checked around with three independents that were all much less than MB - so far I am very pleased with the results. I also changed out all of the actuator diaphrams as it was no additional labor.
Good luck!

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John Gillespie
1988 560sec - 192k miles
2006 CLK500 - 40K miles
1995 E300 - 202k miles