We are not vulnerable to hackers, and the Anti-cheat is right now causing us more problems as it solves.
From SA:MP forums we see a LOT of people having problems with an SAC error.
The solutions offered seem to get more funny with every post.
We can not update the server to the latest version as there is a bug in the Windows release, but the flood attacks were not really working against our server anyway.
Already one of the well-known cheating programs works with the AntiCheat, no doubt the others will follow soon.
So it comes down to what we want. A stable server or less work for admins. We choose a stable server.