My biggest fear is that it might cripple a rebuild. The thing is going to be used in production, not backup. It dropped an apparently fine disk early last week, 'found' it again on a reboot and took ~7-hours to rebuild (during which it was still accessible in 'degraded' mode).
I've since enabled volume bitmap, which is supposed to make rebuild in such a scenario much faster.
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"Ninety percent of Americans use the Internet. The other ten percent use the banjo."
I mean, it might protect you from as much as 50-60% of viruses, but simply not downloading from dodgy sites and not opening unsolicited attachments has a higher protection rate than that.