Wow, var was so broken.<p>Anyway, we use as much ES6 as Node 4 allows at work. Transpiling on the server never made much sense to me. I also used to sprinkle the fat-arrow syntax everywhere just because it looked nicer than anonymous functions, until I realized it prevented V8 from doing optimization, so I went back to function until that&#x27;s sorted out (I don&#x27;t like writing code that refers to `this` and never require binding, so while the syntax of =&gt; is concise, it is rarely used as a Function.bind replacement). Pretty much went through the same experience with template strings. Generator functions are great.<p>I&#x27;m not a fan of the class keyword either, but to each their own. I think it obscures understanding of modules and prototypes just so that ex-Class-based OOP programmers can feel comfortable in JS, and I fear the quagmire of excessive inheritance and class extension that will follow with their code.