Jamie ,will graded brushes give you the different direction of fall that you get by rotating a crb.? I find that a lot of the time with a rotary a need to wire brush the grout lines, where as with a crb it is just a matter of rotating the machine. Both machine I find have their uses, flat surfaces for rotary s but crb s do come into their own on uneven surfaces. Aggitation of carpets with a crb is far more effective .Peter