Robo vacuum cleaners are not cheap! These parts work well together and allow for cost-effective planned maintenance that extends the life of your investment. My Roomba works EVERY NIGHT to fight dog hair on hardwood floors. I change filters regularly and brush once a quarter. I also take the parts apart and wipe them gently as much as I can. I buy this replacement kit every year for about $30 and have been running my Roomba for over 3 years now. It just makes sense!