This looks very interesting in the same way as Clojurescript but with F# and potentially a smoother experience. Has anyone used this that can provide some insight into it? Does it work with entity framework? OWIN? What's the story with the F# to javascript compilation; did they invent that or is it another project? Who are these people? I think it's a shame that the C#/.NET ecosystem can't seem to have FOSS nice thin…
"OWIN?" -> It can, with WebSharper.WebAPI [1].
"What's the story with the F# to javascript compilation; did they invent that or is it another project?" -> It's an in-house developed compiler.
"Who are these people?" -> A Hungarian company called IntelliFactory.
(full disclosure, I work at IntelliFactory.)