This is cool, in concept. But there's no way that drawing all the shapes manually is an improvement over my existing system for creating annotated wireframes using Balsamiq (https://balsamiq.com/) and Red Pen (https://redpen.io/).

While I certainly do like feedback from the team, I don't want other people marking up my wireframes in a way that makes it impossible to tell who drew what / said what.

Site note, the latest version of Balsamiq is REALLY great. They added a bunch of simple things like Font Awesome Icons, and the ability to keep all the project wireframes in one file.