I've had three major pieces of work done for my 2011 Porsche Cayman S at Eurocar-Werk: 1) TPS Racing after-market turbo kit installation, 2) new transmission installation, and 3) full engine replacement. In all cases the shop's work is superb - I've never had any doubt that my car is in the hands of first-class experts. The staff and owner (Eric) are friendly and easy to communicate with. I'd absolutely recommend Eurocar-Werk to anyone in need of high-end car service.
The only thing I can note that's less than top drawer is that the work always seems to take a long time. On the engine replacement some things happened that were out of their control (Hurricane Harvey, and the first engine they procured had a defect and had to be rejected), but all three of my work items at Eurocar-Werk have taken a length of time that felt pretty long to me. And while you're waiting you don't really hear from them very much. They're always friendly if you call them, but a few times I had a bit of an "am I EVER going to hear anything about my car" feeling.
So, I recommend these guys highly, but just be prepared to call them if you want interim updates on the progress of your work.