According to the influencer, the weight is 100 g. I have 25 g (+lenses) glasses I wear often, and even that is right on the upper edge of what's comfortable and needs almost-uncomfortable tight arms to stay steady when my head moves. And, that's all as somebody who's worn glasses all my waking hours since like age 10, complete with nose-indent calluses. Either those Meta glasses are clamping uncomfortably hard on the sides of your head all the time or they'll fall off the first time you lean forward.

Maybe users will develop a distinctive posture.