I decided to do a little quasi-experiment where I combined this device with a muse headband, which reads and tracks brainwaves.
During my "control" meditation where I did not use neorhythm, I was in a calm state for about 10% of the 35 minute meditation.
During neorhythm + muse, I was in a calm state for 50% of a 20 minute meditation.
Possible confounds: placebo.
Neorhythm session followed the control session and may have benefitted from momentum (unlikely as I was actually growing more agitated by the end of first, with brain activity increasing) Possible that muse was reading neo's signal (presumably not since neo's signal is far weaker and depends on entrainment according to specs)
Seems to work!