I have the maxi das. It was 800 on eBay brand new but a returned item. It works for the w210 and up nicely.

Also it works for Vw Bmw and every car almost. Lots of various adapters for various cars.
It really sucks when an easy part to replace has to be coded and you can't do it. I'm interested in what "coding" or "enabling" functions. I read the Sbc had to be "coded" and figured I couldn't do it so took it to a shop. I bet I could have done it though. The maxi can do some changing of options I know.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius