Excluding the performance issue, which largely seems to be confined to instances where polyfills are required, the cons don&#x27;t seem so bad. The tooling will improve as the library and community mature, and other problems are being addressed already by the looks of it.<p>I&#x27;ve got a project in the pipeline for which I was planning to use Cycle.js, but I&#x27;ve always had a niggling interest in Polymer.<p>What I&#x27;d like to know is whether Polymer offers any significant pros, because after consuming some of the docs the offer seems to be a <i>better</i> reimagining of ASP.NET WebForms. What are the benefits?