Z3 component readiness?

Hi folks,

I'm very new to CPS-Project, and I really need a shared-calendar 
component (and the remaining components eventually as well).

I'm on a fairly tight schedule, so I'm nervous about biting off more 
that I can chew with an instable system. 

What's the realistic status of the Z3 port of cps-project?  I can't 
really tell (and I apologize if it is obvious and I've missed).

TIA
Mike