I'm really glad to see this topic- I saw Sophos UTM and thought it sounded interesting. The set-up tutorial is helpful and answered my question regarding whether this can be used instead of AV software on PC's- it mentioned there were no issues get updates from security software, so I think this means Sophos UTM does not replace locally-installed software. I guess that also makes sense because threats may get in other ways. So, the way this works is you set-up on old laptop and then just leave it running 24/7, and you have something closer to corporate level network security? Pretty cool that this is free!