What can't you do with PowerDraft

We have licenses for Powerdraft but aren't using it.  I have a co-worker who I think could use it, but I don't know what the exact differences are between it and full Microstation.  I don't see a feature by feature comparison anywhere.  What I really need to know is what it doesn't do.  Also want to know if existing Microstation workspaces (interfaces, customizations, etc.) can be used in PD.