I recently purchased THEONE and so far it has been very easy to customize. I did have 2 questions though:
1) Is there any way to make the animated logo box a rectangle rather than a square?
2) How do you change the icons in the icon boxes. It only allows me to set FontAwesome icons but there seems to be no area to select the different icons (see screengrab below)
1) It is possible by custom css. Plz refer the line 653-699 in style.css (default width is 150px )
2) The icons is supported custom image icons(png) also. You need go to wp-admin / Theone(theme options) / Icons and upload your custom png image.