[Spongeroberto]

The two way binding can be so useful though. The best example I've seen was an array of coordinates bound to a directive that used D3.js to visualise it. There were some special function you could call that would affect and expand your data and immediately update the graph, and you could manipulate the individual points on the graph and it would propagate to the data seamlessly.

I guess to me two way binding is one of those things that you don't think of often, but when you don't have it you suddenly find yourself writing tons of boilerplate code to get the same effects.

The only cases when I didn't want the two way binding were when I was creating or editing an item. And then it's trivial to bind the form to a separate object while you work on it, then push your changes to the collection/original when you're done.