You don't need VS for TS. Eclipse and WebStorm support it pretty well. I've evaluated Visual Studio, Eclipse and WebStorm, and Eclipse and WebStorm are better for TypeScript development, at least if you're using Node.js.
I still use it, but I often get invalid highlighting, etc.. Then I update to the latest EAP because it's supposed to fix this particular issue... and then other appear. Hmm, annoying...
I tried the VS version as well, and there the highlighting and refactoring works very well... but the editor is waaaay slower so I always give up. Funny because it works fine when working with other languages such as C#.
1) Report bugs, they get fixed pretty quick 2) EAPs are not guaranteed stable 3) It's early days yet, it'll get better.