You don't need antivirus apps to protect your Mac. To find out why, read this:
Mac Virus/Malware Info
You do realize you're responding to posts from over a year and a half ago, right?
Sorry, didn't check the time stamp of the older posts but I was responding to the most current poster with content from within the thread.
You do realize the OP was asking for an opinion about a VirusBarrier Express while not asking about whether or not AV software is needed, right?
The OP might work in an environment that requires the installation of AV software. The OP might attend a university that requires AV software to connect to the network. Or possibly many other scenarios.
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