I haven't run untangle for a while but I remember some viruses would still slip through. Also was disappointed when they dropped Kaspersky as their AV provider.
Also found the free modules were good to show the box was working but for real protection you needed the paid modules. (webfiltering/antispam/virus protection were the main things I was after and checked out).
If you're going to run an esxi server you could also run untangle on there. They don't recommend it, but unless you are going to be using anything like voip which is very timing critical, it shouldn't matter.
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