The idea behind this plugin is good, but there is many problems.
This plugin is slowing down websites. My website loads in 1,2s after activating this plugin my website loads in 2,4s.
The pro version causes many conflicts with my genesis theme. I need just to activate the plugin to see the results, my theme looks all weird.
I still don't understand how a wp plugin can change theme display!
When i try to deactivate the plugin i got a blank page. And i cannot access my plugins administration page anymore. I was able to remove the plugin using ftp.
I think the free version is more stable than the pro version.
My advice get away from the pro version.