Definitive guide of when to use .get

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Always use get(), and use it in one of the following two ways:

// If obj is guaranteed to not be null or undefined
obj.get('very.deep.nested.property');
// If obj might be null or undefined, or if it's not an Ember object,
Ember.get(obj, 'very.deep.nested.property');

Using get() is the only way to ensure that the Ember computed properties will always function properly. For instance, in your example, consider if model was a PromiseObject (which Ember-Data uses quite a bit):

// This will not work, since it won't activate the `unknownProperty` handler on `model`
var startDate = parentView.controller.model.createdAt;
// But this will work
var startDate = Ember.get(parentView, 'controller.model.createdAt');
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