I would appreciate text label buttons, as I usually have to review the tooltips whenever I want to toggle one of those buttons.
The difference between the "Unchanged" and "Ignored" icons is very subtle, especially in the dark theme where the subdued black outline is lost against the dark background. The same goes for the "Subdirectories" and "Change Set" button icons, where there's just a touch of pink or red on one icon. For those with protanomaly (reduced sensitivity to red light) or protanopia, there would be less difference.
In the following dark theme example, the "ChangeSet" icon would look slightly grey compared to the "SubdirectorContents".
When the window is full screen, there's plenty of room on that toolbar for wider text buttons. Unfortunately, I usually snap the SmartSVN window to half of a 1920x1200 display, and that leaves much less room for wider buttons, but I could always change the layout and relocate the Directories panel from it's default position left of the Files panel.
If text labels cannot be used instead of buttons, perhaps different icons would help.