Snap’s latest generation of augmented reality Spectacles have been lambasted by one of the engineers who helped to create them. The glasses, revealed earlier this week, were described as “a disaster” by Sterling Crispin, a former design engineer for Snap.

Powering the new Spectacles is the new Snap OS and a pair of Qualcomm Snapdragon processors, which Snap says will split the processing tasks. During the demo, Spiegel also used the glasses to take a video of the crowd, so it appears that these spectacles will maintain some of their original utility.