The eraser works great, once I erase something it is all but impossible to tell that there was ever anything highlighted in the first place, even when I am really looking for it.

These are great and the eraser works really well; however, they run out REALLY fast so too expensive in my opinion.

These work super well for tracing patterns then erasing.

The yellow and orange work well for highlighting, but the others are a tad too dark (green) to way too dark (purple) to actually use for highlighting anything