a MUST for stone floors

at our vacuum cleaner mandatory Combined brush was there when buying, when we bought him about 2.5 years ago. This is however, not suitable if you almost only has stone floors as we did. For more than half a year they scraped according to the metal on the ground, because the bristles were very worn. Eventually I discovered this brush and have to say now vacuuming fun again. The brush slides easily across the floor and pushes the dirt and not just in front of them.
Only the original price of nearly 40 EUR I find somewhat exaggerated, so a star deduction.