I find SpamTitan to be an excellent advanced email security solution for my organization. SpamTitan blocks spam and malware in an easy to use manner. SpamTitan has nice reporting tools as well that shows the numbers and bad stuff the solution stops dead in its tracks. I can't say there is anything I dislike about the solution and we've been using it for many years now.
I wouldn't hesitate recommending this product to others, we are extremely happy with the product and have no plans on moving to another spam solution anytime soon. TitanHQ seem to be one of the few software vendors out there that truly value our business.