I just received the BotVac D6 as a warranty replacement for my D5. I'm used to the fact that the brushes in my D5 are relatively quiet on our tile floor when the robot is cleaning. D6 and D7 have different brushes. They come with straight bristle silicone paddles. It cleaned well, but one thing I noticed: you could hear the brush slapping the tiles as you walked, and the robot made weird vibrations. I ordered this knowing the D6 and D7 can use any brush. Installed and now runs very quietly. Also cleans great. I think a different brush would be better for carpets and rugs that we don't have in the house.
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