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It looks like they're using one 10x10 array of electrodes?

With say the traditional EEG electrodes, they seem to cover all over the head (some with say around 128 electrodes).

I understand that they'd get a higher quality signal, but is the fact they're only using electrodes over one area of the scalp a disadvantage?

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I don't think that's what's happening here. It appears there are electrodes at each extreme and intersection of each strap. The micro needles are likely part of a single electrode, with the purpose of avoiding hair, reducing electrical impedance by penetrating the outer layers of skin, and reducing motion artifact by anchoring to the skin.

You're looking at one electrode. There's ten of those things (though they want to add more). The point is to make good contact with the scalp through the hair without needing to shave and/or apply contact gel.

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