I must note that I haven't used Symantec's antispam solution(s). So this is not a review of their product(s) in any way in terms of that - but it is a review in the broad sense of that I refuse to let any company for which I have purchasing authority buy any Symantec product. I have had years of nothing but awful experiences with them, and I refuse to further bother with them.
So while perhaps in the past year or two they have dramatically changed, become wonderful people, and have the best product in the world - I suspect that the reality is that they are still awful.
Again, note that this is dripping with personal opinion, feel free to ignore it.