Checkbox: <input> vs {{input}}

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  isChecked: true,
  isCheckedTwo: true,
  isCheckedThree: true,
  appName: 'Ember Twiddle',
  actions: {
  	foo() {},
    fooTwo() {
    	this.toggleProperty('isCheckedTwo');
    }
  }
});

templates.application.hbs

First checkbox won't update the isChecked value, second and third checkboxes will. Try it out:

<p>
  <label>
    <input type="checkbox" 
         checked={{isChecked}}/> 
    <span>(isChecked: {{isChecked}}) angle bracket checkbox</span>
  </label>
</p>

<p>
  <label>
    <input type="checkbox" 
           checked={{isCheckedTwo}} 
           onclick={{action "fooTwo"}} /> 
    <span>(isChecked: {{isCheckedTwo}}) angle bracket checkbox</span>
  </label>
</p>

<p>
  <label>
  	{{input type="checkbox" 
            checked=isCheckedThree}}
    <span>(isCheckedTwo: {{isCheckedThree}}) curly brace checkbox</span>
  </label>
</p>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}