Review on DerBlue Replacement Parts for iRobot Roomba 800 and 900 Series Vacuums with 5 Hepa Filters, 5 3-Armed Side Brushes, and 2 Sets of Tangle-Free Debris Rollers by Diane Haney

I found out the hard way that iRobot will make you order their expensive parts. This makes Roomba think it's on carpet all the time as they don't have the exact size, weight and balance of the OEM brushes. This way Roomba runs at high power consistently and returns to the charger more often.