Its as good as the rest.
Not in the most recent comparative tests. See this, from April 2014:
AV Comparison Summary.
Here's the complete article:
The Best Antivirus for 2014 | PCMag.com
The best free protection (according to PC Mag) would be AVG free plus Malwarebytes Anti-Exploit Free - plus browser plug-ins such as DNT, ABP, Noscript etc.
SD