I was looking for a easy to use captcha system to integrate into my registration pages and this extension did just that plus more.
A good feature I like about this extension is that it includes several different types of Captcha styles and the ability to configure them even further by specifying background colours, fonts, rotation etc.
I am a beginner to Joomla and found this extension to work flawlessly. I'm using Joomla v1.5.3 and have experienced no problems. It's easy to install and to get going. AAA! Look forward to the official release. :)