Calling Mac users - Have you installed antivirus on your Mac?

Apple now recommends that users install antivirus software on their Mac systems. Well, have you?

The knowledge base entry on Apple's support site is short and to the point:

Apple encourages the widespread use of multiple antivirus utilities so that virus programmers have more than one application to circumvent, thus making the whole virus writing process more difficult. Here are some available antivirus utilities:

- Intego VirusBarrier X5, available from the Apple Online Store License: commercial   - Symantec Norton Anti-Virus 11 for Macintosh, available from the Apple Online Store License: commercial   - McAfee VirusScan for Mac License: commercial

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It's worth adding that there is a free antivirus program called ClamXavfor the Mac.

But is it worth the cost and hassle to install antivirus software on the Mac, or is Apple just covering its back with the knowledge base entry? Having given the impression that Macs are invulnerable to malware, this change could unnerve some users (though personally it's hard to see it as anything more than an indication of the times we live in and the fact that there are plenty of Mac users who are just as gullible as Windows users).

Personally, I can't be bothered to install any on the Mac mini we have here, but if I was processing a lot of back and forth email on it I might install AV just in case ...

Anyone here have any experience with AV software for the Mac? Is it as bad as most AV software for Windows is?