JS Models are good

//The real difference is when you add functions into the mix, lets say you want to perform an operation on the data.
//This could be a simple as turning it into a format or saving it to the server. The thing is, it is a lot easier when
//You use classes as data Models.
function Foo(a, b){
    var self = this;

    self.a = a;
    self.b = b;

    self.turnIntoFormat = function(){
        return a + ": " + b;
    };
}

var data = [new Foo("a", "b"), new Foo("aa", "bb")];

//VS this, which is easier?
var data = [
    {
        "a": "a",
        "b": "bb",
                turnInfoFormat: function(){
            return a + ": " + b;
        };
    },
    {
        "a": "aa",
        "b": "bb",
                turnInfoFormat: function(){
            return a + ": " + b;
        };
    }
];