Well, yeah. I've used it, and if you're using Unity, it's the only serious option. It's still terrible, because it tweaks out ReSharper (for very good reasons on ReSharper's part--Unity thinks dumping everything in one namespace is a good idea and all sorts of stuff breaks otherwise) and because there's no real support for the dog-stupid not-actually-JavaScript that you're forced to contend with because so much existing code uses it.