I did some work with the Neurosky Mindwave Mobile headset. Compared to OpenBCI it is cheaper and more practical to use, but on the other hand it only has one ch

I did some work with the Neurosky Mindwave Mobile headset. Compared to OpenBCI it is cheaper and more practical to use, but on the other hand it only has one channel and a resolution of 512hz. It is mainly useful for neurofeedback training and assisting learning technologies. It has been used for simple BCI tasks. OpenBCI offers more channels, and I suspect a higher possible resolution. You'll have to get more involved with the hardware though, both in terms of rigging a device and electrodes, and programming the hardware on the chip (arduino). More channels means that you can increase spatial resolution, which allows for easier discrimination between mental "switches", more advanced diagnosis and feedback. Still, keep in mind that you need to get dirty with the hardware!