The Angular team at Google can make whatever changes they want, but they are required to update 1,000+ internal Angular applications if they make a breaking change, so it's a relatively stable framework. There's a new major release every six months, and upgrading is usually fairly painless.

It's fantastic for large applications. I've used it in a large product with hundreds of pages and forms and dialogs, and it would have been a nightmare without the sort of structure that Angular provides. It reminds me of Rails a little bit, in that it's opinionated about how things should work and you might feel some friction if you try to do something unusual.