The Three largest typical expenses are your house, vehicles and your homes flooring. Why should you use an inferior or the wrong type of vacuum on your third largest expense? Not only are you not cleaning and keeping the dirt, dust and dander particles trapped in a well built and filtered vacuum. You are blowing them into your air to breath into your lungs again and again. Vacuums not built to last or filter the best (no matter what the ads tell you) also break down and die easier than quality vacuums. Therefore you are buying in a time span two or three vacuums and spending more than what one quality vacuum would cost. That would still be working and be doing a better job. Do the math!