Top critical review
imitation brush-arms do not spin fast
September 9, 2018
The brush-arms are slighting more elevated than iRobot Roomba's; therefore, while they seemingly fit, they will not spin very quickly. At first I thought the arms' unit needed to be dismantled and cleaned, which I was able to do. After that did not fix it, I ordered the brush-arms from iRobot directly. While it was significantly more expensive, the original product brush-arms are more flat and have returned to spinning very very quickly. I might be forced to order this part from iRobot directly now, as I do not trust cheaper imitations. I own the Roomba 770.