Charlie - I'm the author and do plan another couple of blogs in this series. It's funny, I've been doing this for a while and only came across the concept of a "Niko Niko" calendar a few weeks ago. Convergent evolution.
I thought the big thing would be getting early warning on problems, but what I'm hearing is that the team really likes having a forum where they can express their sentiment anonymously and seeing how the rest of the team is feeling.
I think that second piece is more about having a common metric that can be tracked sprint to sprint.
I'm also building on the concepts in my last blog: https://hackernoon.com/can-we-apply-devops-principles-to-pro...
The product is young, but so far the feedback has been positive.