First of all, thanks Steve for the wonderful software.
I think it would be great to have an option to show only the differences, the modifications that would be done in the Destination folder, when doing a Sync preview.
For example, having 2 folders that are mostly the same, the preview shows almost all files in black color. I would like to see only the files that are not black colored, i.e. only the files that will suffer some operation (add, delete, etc).