conary vs ports

[ke han]

Does anyone have experience with the differences between conary and  
ports?
Its my understanding the rpath folks have rethought package  
management at a very high level and have something more to offer than  
gentoo's portage (which some feel is the closest thing in usability  
to FreeBSD's ports).
Does anyone have a hands-on perspective of this?  I don't mean that  
"ports already has 16,000+ ready to go ports and conary has much  
fewer".  Nor am I looking for the usual FreeBSD vs Linux  
perspective.  I'm looking for a tech and architecture perspective of  
just conary vs ports.
thanks, ke han