I work in construction doing a lot of BIM design and coordination. The number one complaint I hear repeatedly with Navisworks software is how difficult it is to input dimensions. For instance, in order to align the origin point on 2 drawings you may have to move one of the drawings East two inches. In order for this change to work when you type in exactly " -0ft 2in " as opposed to most other Autodesk and CAD programs where you can simply type " -2" "
I feel this greatly slows the workflow of MANY of the BIM coordination meetings I am in, and is complained about relentlessly. Most CAD drafters tend to have the ' and " symbols permanently programmed into their typing habits for feet and inches, and a small mistake entering these on Navis resets the value to Zero. 
