Should have read the reviews! Seems to work well on hard surfaces, except the filters in our dust box were a bit loose, but when moved to carpet it stalled, suggesting the brush has become tangled. The rubber blades on this roller create too much drag for the device to think it's tangled. The original roller uses all brushes. Ordered a replacement direct from Ecovacs and although the rubber valves can also be seen in the photo, the full bristle version arrived.
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