When I took Pony for a test drive, the language itself felt pretty solid; the main obstacle was the tiny standard library.
When Pony's standard library grows to a useful size, it's going to be huge. The type system is gorgeous, the documentation is pretty good, and the community is extremely friendly and helpful.
I wish I could target the browser too. Like my biggest problem is writing a front-end and backend in two languages. If I could do both in one, that would be such a killer feature.