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I would only buy a device like that if they offer full access to the data, with no need for subscriptions or accounts, even if they are free.

This reminded me of Galea, a nice EEG device and Mixed Reality headset all in one

https://galea.co

The Bridge Between Mixed Reality and Neurotechnology

https://assets-web-varjo.s3.eu-north-1.amazonaws.com/wp-content/uploads/2022/05/27124826/HERO_1_LIGHT-1536x864.jpg