Ask HN: Do you use Socket.IO 1.x in production?

Socket.IO 1.0 was released this spring. It is supposed to have better scalability and performance than 0.9 ([1]).

I couldn't find any benchmarks or production stories of Socket.IO 1.x on the internet, though. This raises the question: Does anybody even use it in production?

If YES: How did 1.X work out for you? In particular, how well does it handle large number of concurrent connections (e.g 10000)?

[1] https://news.ycombinator.com/item?id=7811674