I just worked on something similar at a hackathon this weekend with the Muse Headband, it was really fun. We used a support vector machine to maximize the "calmness" output of the band, which is some weighted sum of gamma and beta waves I believe.
fyi, this doesn't make sense.
This was custom-made by the way.
They (claim to) have [0] a bunch of PhDs, and have a page with the same kind of words on [1] as parent.
[0] https://www.brain.fm/about
[1] https://www.brain.fm/#scienceYour implied complaint was that their work is not very scientific. The team having PhDs in neuroscience is irrelevant/unsatisfactory/bad?
What would you like to see? Would it have seemed more scientific to you if they'd done it at a hackathon?
My point is that the work itself is what makes something scientific, not the workers' CVs (note the careful wording here; calling them researchers is another appeal to credentialism).
With that in mind, what would I like to see? You should be able to answer that one yourself now.
I'd say it was pretty easy compared to Myo, but I wouldn't pay $300 for one. I'd use it again though if it was available for a weekend.