It is like an extension found in Chrome browser. It feels like a part of PowerPoint and act like one. The tool contains enough stencils to start with basic works and intuitive enough not requiring any types of training. If know PowerPoint, you will get right into it without asking questions nor looking into instructions. The stencils have been updated with more shapes and you can keep virtually any type of png stencil into the library. I have installed it on to PowerPoint 2016 Preview and "It just works"! It also easy to build up your own favorite library of stencils and shapes. The easiest way for uploading multiple shapes is using PowerMockup ribbon. The version 4.0 you can import graphic files (EMF, JPEG, PNG, etc.) directly into your "My Shapes" library via the "Import Shapes" button in the PowerMockup ribbon. The dialog lets you select multiple files at once.

Personally I prefer a software is clean design and easy to follow. This software is easy to use. As a newbie, it took me 5 minutes to figure it out how this software works. I bet most of the users will agree with me. Nothing too fancy, no traps, no advertisement. You can barely find a good software that can compete with this one.