Very sophisticated framework. Based on model and bi-directional binding that updates model and view. Gives power at your fingertips but it requires lot of time to understand some of the features. I'm sure that after learning AngularJS I'd be very efficient and robust. But now I stuck on some topics.
Still I recommend it more than jQuery. Besides that, jQuery still can be used to unleash the power of UI animating and modifying.
Quite easy to learn (but e.g. Sammy.js is a bit easier) and powerful JS framework. The syntax of directives and filters might be not intuitive at first. The "content replace" effect is kind of annoying. But in general, it helps you write good quality code in both scripts and views of your frontend application.