I've been using this tool since a year now to quickly build HTML5 banners for DoubleClick. 1- the software was way too buggy than it is now, yet, it still is, and updates aren't that frequent. 2- all objects are positioned absolute, even though you can choose to create a responsive banner. 3- for me, it's perfect for ads, and handles animations pretty well (it uses CSS animations) 4- you can always access the generated code and modify it once you understand how it works. 5- I would never use it to create anything other than ads. 6- the UI sucks, especially when the biggest part of the process is adding assets, modifying their properties or settings their CSS, and you constantly have to resize the accordion drawers.