On the site I tested this plugin with, I am using a theme (Antisnews by antisocialmediallc) that can itself be somewhat quirky. When I am logged in, it makes me reload my homepage twice to see the contents properly; so this may not be the most fair review. But...
I felt that if this plugin was caching an html version of the page I should not have that problem any more. Not only was that not the case, but this plugin at first cached the blank page. At other times every object on the page was totally skewed and very bazaar.
On single post pages, at times part of one of the sidebars would be missing.
The point of a plugin like this is to offer a consistent and very fast presentation of your website, and this is not what I got.
For a more "normal" site, this plugin may work fine and the rating I gave will be washed in the mix. I hope this is the case.