I've glanced at the website and intro tutorial. I'm familiar with a lot of the concepts behind it, eg. functional reactive programming. Sometime I mean to do a small prototype with it, just to try it out and get a sense of what it offers.
Popularity has never been a significant concern of mine - most people are sheep who follow the crowd, and so if you have hard data and extensive experience, you will either a.) set the trend, so that they follow you or b.) have a big competitive advantage over everyone else. Most great products are founded by doing what everybody else is not, so if you do what everybody else is, you're automatically resigning yourself to mediocrity.
