The ease of use, how it integrates into our app design process with minimal effort required from us as developers/designers is great! It's also very easy to implement in existing projects that don't have an SDK available yet but we will be adding one soon so I can see this being used widely by other teams now too once they've added their own tooling support (which should happen fairly quickly).
We're using gazeify primarily within Sketch where you drag & drop elements onto pages or designs - which works well enough if there aren't any animations involved however when animation does need to occur then things get messy because all items become animated instead. This isn't really something specific to me personally though just more general UX issues around having different components animate independently during page loads etc. If anyone has experience working directly wth sketch please let me know whether its worth implementing some kind of custom script layer between the two rather than relying solely upon native functionality?