Your opinion of the Perfect Anti-spam program

i believe that most of us here have tried Comodo’s Anti-spam program. Some like it, some don’t. some have issues, some have compliments. so here i would like to ask, "If Comodo’s Anti-spam isn’t as useful as what they proclaim, what other anti-spam programs would you recommend and rate better than Comodo’s and why.

Just want to do a survey and gather some ideas. Thanks guys.