What you are referring to is Brightmail Spam from Symantec. We use it and it does a fair job although not the greatest i have seen at telling spam from good emails. You have to work at the setup of either one to get a good balance. We use Barracuda for Archive and web filter and it does well there so use what fits best for you. One(brightmail) will need a server and Barracuda will add another device to care for. As for slayer, he is not an admin. They know how to make things work. Good luck.