DFMPro and or aPriori for DFM analysis and cost estimation for users?

Has anyone used DFMPro or aPriori before? Are there any similar tools out there?

• Is your organization getting benefit from these tools?
• What is your experience with your group using them?
• Any pros/cons from the user side or from an administrative side?
• Do you integrate them into Windchill?
• Is one much stronger than the other in some areas?
• Can they really predict costs well enough for the engineer?

Thanks!