I don't know the language (yet), but I've been keeping my eye on it for a few years, and I think it's going to be fantastic once it stabilizes and gets improved tooling.
I especially welcome the possibility of using a safe language like rust for web development, instead of writing more dreadful javascript...
After 1.0 the Rust releases have been stable, with the stability checked against the entire ecosystem on crates.io. https://blog.rust-lang.org/2014/10/30/Stability.html
There are now a number of typed languages that have solid compile-to-js support. I've done it with OCaml (js_of_ocaml, Bucklescript), F# (Fable), and Elm. For dynamic languages, there's also Clojurescript, which is quite nice.