I have ordered this kit 3 times since we have owned the Roomba 690 for over 4 years. The kit is almost perfect to OEM specs and the filters work about the same as the OEM filters I've bought in the past for a much higher price. Some very fine dust particles may get through the filter depending on use, so it may be necessary to blow out the vent. The brushes have always fitted and worked properly and the replacement rollers have held up well. I usually buy a full set and change the filter every 23 months, then order another when the filters are gone and then change everything. I service Roomba by removing hair, dirt, and debris that gets caught around the wheel arch, vents, and sensors when I change the filter. I feel this has ensured the longevity of the vacuum cleaner.
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