The Inquire Addin is better than nothing, but it seems to be only useful for small spreadsheets.
For example, the Workbook Analysis Report lists all formulas individually, with no concept of how the same formula in relative terms has been copied over areas. I find it hard to believe that such a list would have been accepted as useful in a commercial product.
The worksheet relationship diagram provides little useful information
The Cell relationship diagram tries to draw an arrow for every precedent cell including those in a LOOKUP block: again, not very useful:
I can’t see this replacing XLTest or any other decent commercial spreadsheet auditing package. However, if it gets users aware of the bad smells which the Workbook Analysis Report lists, they may become aware of the need to look further, which is good.