I have look at Go. It impress me the first time, specially the CPS stuff. But now I'm working on Rust (apart of F#, python, Swift). Rust is nice, but too strict, and is very hard to be productive on it.
The lack of generics kills Go for me. I know it's an old rag and they'll never add them, but I just can't get over it. Maybe I should try Rust...
I experience bliss while writing stuff in Go. It is not as fast as C, but it is getting closer with every release. Garbage collection in Go is so fast now that there may as well not be any pause at all.
It's worth a look, in my opinion.