asterisk users - Jan 2007 - How would you compare feature set to a Metaswitch?

OK I need some help. Looking for comparisons for a large customer  
wishing to provide voip service over a region. We are up against  
Metaswitch who is claiming they can do anything Asterisk can do. I do  
not have too much information on Metaswitch so am looking for any  
information, preferably real world experience on how Asterisk and  
Metaswitch would compare side by side.


Thanks in advance.

Jerry