There are already a number of web components that wrap existing slide-based presentation libraries; slide-page is notable for being written from the ground up with web components. The source code for the core component is little more than a wiring together of existing parts in a novel combination. That approach is, in fact, exactly right, and component writing at its best! This component mostly adds sequential arrow button navigation around Polymer's core-animated-pages component. For the buttons, it takes advantage of Google's Material Design theme, specifically the Paper floating action button.
Likes: Great use of existing Polymer and Paper components; some keyboard navigation.
Dislikes: The stock appearance shows a "Powered by Polymer" banner that few people are going to want. It's possible to turn it off through styling, but we like components whose default appearance is the most practical starting point.