Not very happy so far. I liked the idea of some of the features they showed, but it doesn't seem to work with Chrome, or at least that's been my experience so far. I tried sending a message to the developer, and the form on their website is busted, so I don't know if there's any way at all to get hold of them, even if to just let them know about the issue.
Sorry, but if it doesn't work with Chrome, it's a 1-star review for me. (I suppose I should include that I'm running macOS Sierra, version 10.12.3, and Chrome is the current version, but then Chrome automatically updates itself all the time anyway.)