I've been waiting for this for a long time. I wear glasses currently and have always felt that some kind of overlay could provide tremendous value.

From simple reminders, augmenting my environment with meta data, or giving access to real time updates about almost anything the possibilities are almost endless.

Batteries are going to truly be the limiting factor IMO. Forget plastics, the future is batteries. I assume version 1 of the product will require some kind of external battery pack, I'd think it was certainly worth it if the tech is what it should be.