Google Web Designer - create engaging, interactive HTML5-based prototypes

curious if people have tried this out and how it comes to Sketch, Origami, Quartz Composer, etc...

We are excited to announce the launch of Google Web Designer beta 1.6! This release is the culmination of several multi-quarter efforts for authoring responsive content and creating a new UI. We have also improved the workflow around text, enhanced the code editor and enabled our components to render on stage at author time. All these workflows together are helping us make a big leap forward with ad creation. We also addressed a large amount of fixes and smaller enhancements