My Take
Haiku Deck makes it easy to follow the best practices recommended by experts, like Garr Reynolds, writer of Presentation Zen. It allows students to quickly design simple, well-designed presentations with beautiful graphics, nice typography, and a professional polished look. If you're sick of "sliduments" and hideous distracting PowerPoint themes with crazy "Wordart" and bad font choices, have your students present with this tool.
CONTENT WARNING: This tool searches Creative Commons licensed images on the web. Not all images searched are "school appropriate".
How I Use It
I teach the basic precepts outlined in Garr Reynolds book, Presentation Zen. I then introduce some simple visual techniques, such as using full-bleed images. Finally, I introduce Haiku Deck, and students find it much easier than trying to incorporate the same techniques within PowerPoint.