Case for the Defense
This thread seems to have become infected by bigots and bears of small brains. Stick to the facts guys, not gossip about a package you used to run years ago.
We run Endpoint Protection Suite on around 1000+ endpoints across Europe, and on email gateways. We also run McAfee and AVG at some locations. No issues with Symantec for years. Mythical performance load issues not seen (was briefly true in NAV a decade ago ...). Endpoint Management console works fine. Only risks we see are attachments with MS Office macro downloaders, which all the a/v vendors have trouble with, even famous-name cloud mail services.