This is all under the heading on their docs page on "Getting Started"...
Getting started
Add morris.js and its dependencies (jQuery & Raphaël) to your page.
<link rel="stylesheet" href="http://cdn.oesmith.co.uk/morris-0.4.1.min.css">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
<script src="http://cdn.oesmith.co.uk/morris-0.4.1.min.js"></script>
Definitely too skeptical. Every piece of research that 23andme uses to interpret your genetic data is backed by a wealth of citations and studies. Each "discovery" is rated on a confidence scale from 1 to 4, with experimental research being a 1 and undisputed, established research being a 4.
Nothing's stopping you from downloading your own genetic data as a text file and performing the same types of analysis yourself.