Do you have a writeup anywhere detailing your progress and/or what is capable using the api you have created so far? I'm super interested in this I just want a little more to go on than is in the readme.
For example, it's not even clear to me if I need to buy the regular headset (299) or developer headset (500)
No real writeup, but as far as what's possible: all data coming from the headset (gyro, EEG, contact quality, and battery meter) is accessible from Emokit (although the latter two are not merged into my branch yet). This means that you can do effectively anything you want with it. Also, you only need the regular headset, although it's compatible with the developer headset as well.
For example, it's not even clear to me if I need to buy the regular headset (299) or developer headset (500)