M+Guardian Anti-Spam software…better than Gwava and Barracuda?

Messaging Architect release M+Guardian Anti-Spam software and promotes policy-based risk management for business-driven email. Using pre-defined policies that can be specified at the domain, group, or end-user level, M+Guardian allows organizations to define their email security rules centrally.

Would you switch to this product or are you satisfied with your current anti-spam software?