Installed and applied to the default contact form without any problems, the best part unlike some other capthca solutions the edited forms were already available. Avoiding the need to insert code yourself and easy to find where the chagnes had been made.

I don't like to start out with criticism, but there isn't much to complain about with this component/plugin, so I'll get it over with so I can talk about the good parts.
Con: Be comfortable with editing the core code - download, edit and upload files. But that is the only drawback to this great resource!
The install went fine - it was a little troubling to install a component then not see it in the component menu. **I should have really read the forum postings linked to in the description before I installed it.
I tested the form entering the correct captcha, then the wrong captcha. When you put in the wrong values, it sends you to a page stating that it was not entered correctly and on paging back, all my info was still stored in the form - yay! I also tested the captcha refresh and it worked fine. The only thing I haven't tried yet is to change the fonts and used it on a VirtueMart form. Tomorrow maybe!
So, with a few manual edits supplied by the creator, this worked great for me.
Thanks!

This is a really nice extension, which does exactly do what it claims to do. A nice way to add a Captcha to your site wherever you want. I've referenced this in an article that I wrote for the upcomming Joomla! magazin and I'm using it in my own extensions.