CLK63 Black was around $140k new. They're going for $70-90k now depending on spec. I have not driven one but almost bought one before I bought my GT3. However, a couple things held me back. One being some maintenance items on the M156 engine such as head bolts which you can correct with new head bolts, but there also appeared to be some issues that weren't as easy to correct. For me, the Mezger based engines have the coolant line failures, but that's very easy to correct.

https://www.jacobregarlaw.com/blog/2...on-for-the-m1/

The other issue, and the one that actually prevented me from buying it is the lack of enthusiast community. When I went on MBWorld and saw that going back one page on the forums took you back one year, I knew that would be an issue for me as there was just not enough information and a following on the cars. One of the reason I like the E39 M5, E46 M3, E92 M3 community so much is due to the support of owners. With only 300 or so for the US and 500 for the world, it makes sense.

However, it's still one of my favorite cars.

 

Another fan of the CLK63 Black Series here. I love the looks and that wonderful M156 engine. It’s a modern muscle car with excess of style and attitude. Those fenders look mighty swole!

It’s quite heavy, though, and its automatic transmission feels really old. It wouldn’t be my pick for canyon carving, but it’s wonderful for enjoying power oversteer and general hooning.