I get the odd spam in my inbox but it mostly works, there is the odd false positive as well, so unfortunately I have to keep checking my Spam folder.
Interestingly, I set up a 'junk' GMail address for usenet posting etc and the address has the word 'spam' in it; despite being used all over the net for a couple of years it hardly gets any spam at all, maybe the spammers filter out addresses with 'spam' etc in them assuming that they are obfuscated?
"Trust me. I know what I'm doing." -- Sledge Hammer