I have been using SpamTitan for over a couple of years now and I have to say that I have never had any problem with it, actually, it has helped me a lot and I'm very happy with the result. With time, my email has been used to subscribe to a lot of newsletters and other stuff that I want to erase, and this program has been incredibly useful to make that possible. I had no problems to set it up since it is so easy to use and I started noticing its benefits soon after.
It helps having my email free and clean of spam messages. Also, SpamTitan works as an archive system.