This fling is great, but the inability to move to vSphere 6 caused me to look at alternatives. What I did was build a new vSphere 6 vCenter, export the vDS’s from the old one, connect the hosts to the new vCenter and then imported the vDS’s I had no issue with a migration to a new clean installed vCenter, and roll back is as easy as connecting the servers back to the old vCenter.
Good luck everyone