"SourceMod Anti-Cheat is a server-side plugin comprised of different modules to help protect your gameserver against common threats, hacks, scripts, exploits, commands, cvars, or cheats currently being used today to cause your servers harm"
Kenny and I have used SMAC before, it is a server side anti cheat so it isn't gonna change a whole lot. It MAY catch a couple of cheaters but it is not gonna clean the servers up completely. Server side anti cheats are easily bypassed, that is why VAC is in the state it is. You can add it and it shouldn't hurt anything, if anything it will help a bit but we shouldn't expect great changes.