I ordered a trial spiral brush when I needed to replace the original (flat) brush that came with the Neato D7. We have 2 dogs and a cat so I turn on the vacuum every day. I noticed that there is hair on the carpets every day. When I cleaned the dust box (daily), there was some hair and dust in it, but not as much as normal cleaning. When I turned the robot over, I found that the hair stuck together in the middle of the brush, where dust, dirt, and hair ended up in the trash can. I cleaned the basket and roller daily and tried again within a week - same result. I returned the car to its original style. We have clean floors again and no lumps. I hope this review helps others when choosing a replacement brush.
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