I've got a muse, and it works wonderfully (at least, compared to Neurosky sets). The most frustrating bit is that there's no API -- meditation is good and all, but I'd really like a sensor of that quality that one could hack with.
So there's a sleep tracking EEG gadget and a meditation EEG gadget, but not one that can do both.<p>I would like it if these devices all communicated over a common protocol so the sensor bands could be separated from the software.<p>I dissected the OCZ Nia protocol once and it wasn't pretty, it seemed a lot of smoothing happened in the proprietary driver. Maybe these devices all have the same issue, making smoothing in each band's firmware cost prohibitive.
Wikipedia has a nice table listing all the EEG headsets and how to make your own.
<a href="https://en.wikipedia.org/wiki/Comparison_of_consumer_brain%E2%80%93computer_interfaces" rel="nofollow">https://en.wikipedia.org/wiki/Comparison_of_consumer_brain%E...</a>
Tim Ferriss just posted a detailed article by Shane Snow that goes into some detail as well: <a href="http://fourhourworkweek.com/2014/09/12/muse-interaxon/" rel="nofollow">http://fourhourworkweek.com/2014/09/12/muse-interaxon/</a>