Spamfire is a good tool, to be sure. Nevertheless, it does not remove spam from your inbox, as advertised. Moreover, it fills your inbox with spam which you then have to wade through to find the legitimate emails. Some have to be rescued, others are easy to identify. Only after dealing with this inconvenience, can you rid your inbox of spam.
POPmonitor on the other hand, indeed removes the spam from your server, thus leaving many fewer spam in your inbox. If Spamfire could do the same, it would truly be a great tool rather than just a good one.