Waited so long for a mundane headphone that doesn't do the job. They firstly promised a developer version that will allow using API to get the data from the EEG but during the long time of production, they remove the option without notice to the customers. Without proposing to reimburse the headphones. Only because I claim they pay back the difference between consumer version and developer version.
After I receive it, the EEG was not ready. One more year to wait and finally when the app and the firmware are supposedly ready, the EEG never worked, always indicating "Syncing sleep data" during more than 5 months.
Now, the time to return passed. So, I just learned, never put money in Kickstarter. This kind of company abuses the trust of the customer. So don't be surprised to find anybody on your next fundraising.
In the end, I have to admit the only good thing: the relaxation song in the app, that's all.
Bottom Line: No, I would not recommend this to a friend