I followed all the steps to install it, made a sample slide deck and it was flexible but not beautiful. As it shrank the text slowly covered the whole image until mobile readers wouldn't see it at all.
So the image is flexible but the text isn't. No way to customize the font to match my theme using CSS. Right-clicking on it only talks about the slider and where to get a free copy.
Works wonderfully if you have no other needs beyond what they have in their templates.. otherwise not easily integrated with my theme, design and css.