The ability for us as customers to have confidence that our networks are secure from attack by hackers/guests of companies we contract with. We no longer need to rely solely upon antivirus software or manual patching to be assured about this! This has been great!! No issues at all - so far. It's hard not to love it. Nothing really yet - but I'm sure there will come time when something comes up with their services (like any other business). As always however you can go elsewhere if things don't work out correctly after trying them first. Have peace-of-mind knowing what level protection is available for you infrastructure against attacks from within AND without your knowledge.