Been using it production for a couple months now, no issues. We have a reasonable number of IO.js powered microservices, we've seen anecdotally better performance for some use cases but regressions in none, however we've seen SIGNIFICANTLY cleaner code (ES6 yay!) and a much simplified build (no transpilation to ES5!).

Was nervous at first, but now I see no reason to use code Node again.

There seem to be a few people who like to merge node and IO, but I have the impression most of the community doesn't want to merge.

I think node will go down in favor of IO, because they can't keep up.

Yes, I think so.

Yes

Personally I would wait but you can certainly use io.js as you do node. I commented elsewhere in this thread about my whys so I won't be annoying and repeat them here but if you want to experiment or need some bleeding edge performance in some of the areas that io.js is faster (the newer V8 isn't faster in all situations) go for it otherwise I'd stick with node for now.