I went to one of FB's early internal meetups about React and I was initially skeptical of JSX but very excited by what it offered. I was working at Groupon and

I went to one of FB's early internal meetups about React and I was initially skeptical of JSX but very excited by what it offered. I was working at Groupon and using Backbone at the time and found nesting components to be a major hassle. We used a framework called Thorax on top of Backbone, which helped but still fell far short of React's convenience.