They are great. After our Robbie vacuum cleaner has worked, we empty it and put in a new filter. Then we take the dirty filter, wash it in the sink and run it through the dishwasher in the cutlery basket. After about 20-30 cycles the filter starts to wear out, but for a box of 12 that's 240-360 days of cleaning instead of maybe 30 days with OEM filters that you pretty much have to vacuum with another vacuum. reused.