You might be pleased to know that they aren't even in beta anymore. They're in full blown production release mode. No more breaking nightly changes. No more unstable syntax or language behaviors. So really...there's never been a better time to give the language a look-over

Go give it a try!

Fear not, friend.

If you're looking to be ES6 complient and would like to get the practical effects of the spec without having to wait for browsers to catch up, you can use something like BabelJS to achieve it!

The Setup and Usage sections of their website walks you through installing and using Babel in around 2 dozen different ways (Browserify plugin, Gulp task, Jade template script tags, Webstorm plugin, etc etc).