I installed WP Clone on a live site using WP 3.3.1 and was able to copy the entire site to an installation on localhost in just a few minutes. The process was extremely simple. This is an excellent plugin!
I did experience just one issue with Contact Form 7, however. An error message was displayed and the site did not display correctly until I deactivated that plugin. I removed the Contact Form 7 plugin and then installed the latest version and the site is now working perfectly in its offline location on localhost.
I then did a manual upgrade of WP to version 3.5.2, and I also updated all of my other plugins. Again, all is working perfectly. WP Clone allowed me to copy my entire organizational website to the offline location to test these upgrades. It's a great tool ... a first class plugin!