As you all know, in the deco tool there are three differences modes:
1. The Symmetry Brush effect mode.
2. The Grid Fill effect mode.
3. And the Vine Fill effect mode.
Inside the Symmetry Brush effect mode, in its advanced options, there is one option named 'Grid Translation', which allow you to create a grid effect from a selected symbol, so I simply wonder what's the difference between this advanced option of the Symmetry Brush effect to the 'Grid Fill effect mode' that also enable you to do just the same thing!!!!
Everybody who think that he found one or more differences between the mentioned above modes, is invited to post his opinions here.