Comment: Used it, loved it (Score 1) 1
I've been one of the first developers (and users) of Opa, from an early, early, early stage. At the time, the technology was very promising, but not quite mature yet. It took us years to reach the kind of usability and maturity that we have now. And I can testify that Opa is now not only a great technology – it's also ma favorite programming language.