I had a chance to meet marcel van lohuizen when I was working for the company where he was an advisor. He was still working on Cuelang when we met.

He is one of the smartest guys I have met in my life. Cuelang's value proposition is very difficult to see if you starting. There are lot of pre-requisites that you should be aware of. But when you have to deal with 100s of config files and specs, it is a lifesaver