My initial impression upon seeing the spectacles was that they had two cameras. They don't, but the impression points to a key design choice that was, IMHO, fatally absent from Google glass: attempted symmetry.

I think that people will be more likely to wear the spectacles for this reason--they can actually pass for a pair of somewhat ostentatious sunglasses to an unknowing observer because of their near-symmetry, vs. Google glass, the mere shape of which screamed "BORG!"