Not one I've tried, although as you say they make great claims. Being on severe budget, I've been using InoculateIT and AVG without problems. The claim of a small footprint is attractive for older systems.

The parent company is here:

<a href="http://www.esetsoftware.com/home/home.htm" target="_blank">http://www.esetsoftware.com/home/home.htm</a>