Hevacomp User Migration to OpenBuildings Energy Simulator (Update 7)

Hi. Are there any other Hevacomp Mechanical Designer users currently learning to use OpenBuildings Energy Simulator (Update 7)?
I am new to it myself and would be interested to know how you are getting on with the functionality of the Energy Simulator platform for modelling and steady state calculations.

How do you feel it compares with Hevacomp Mechanical Designer DDB?