Good product fulfills its function

Sc5800C used with these brushes come in supplement / replace the one supplied with the unit. In use they are effective for tile joints, corners. It is true that the fibers eventually bend and damage but the use made is energetic on rough and dirty materials, hence the usefulness of that lot. But I prefer it to be the brush deteriorating rather than the cleaned surface.
The two colors are a good idea but 4 different colors would be even better.