Whats your thought on whats the most efficient GUI for E+, esp for LEED modeling. I found designbuildign and OS has their own advantages but sometimes their limitation will make me go back to the old Trace, which is extremely efficient in setting LEED baseline and generating nice report. DB for example, is unable to model heat recovery chiller. OS on the other hand, is slow because most of the inputs are done by drag and drop. And both GUI has limitations that eventually you need to use E+. But its hard to go back to GUI if you want to change the geometry or HVAC.