Have not heard of it before, but you could take up their 30-day free trial and let us know what you think.
On my other PC I am trying out on 90-free trial Microsoft's Windows Live OneCare.
Find it very good so far, it incorporates a 2-way Firewall, Anti-Virus and Windows Defender which means you have everything protected on your PC in one program. It also cleans the PC of redundant files, and will backup your data.
See my thread in Consumerwatch last week headed "Anyone tried Windows Live OneCare" for more details.