I ordered 2 of these filters in November 2012 for my Eureka Optima 431F light handheld vacuum. They work very well - better than the filter that came with the machine. As some reviews of this machine say, dust, hair and dirt tend to collect in a big clump at the top of the filter and this happens more or less instantly. Maybe this is a design flaw, but it's easy to deal with. Just clean the filter every time you vacuum - it's like removing the lint in a clothes dryer. I do this by using a stiff scrubbing brush to scrape away the dirt. It only takes a few seconds and makes a huge difference in suction power. Periodically (about every 6 weeks or so) I wash the filter with mild detergent and warm water and let it dry. So I bought two so I always have a dry, clean one for my car. I just bought 2 more of these because the ones I bought 2 1/2 years ago look a little muddy and fuzzy but they actually work fine. FYI, the "correct" part for my model is 75273-1.
Xiaomi Mi Robot Vacuum-Mop 2 Lite RU robot vacuum cleaner, white
198 Review
Dyson V8 Absolute: The Ultimate Cordless Vacuum for Effortless Cleaning
142 Review
Robot vacuum cleaner Roborock S5 MAX Global, black
298 Review
Xiaomi Mi Robot Vacuum Cleaner 1S Global Robot Vacuum Cleaner, white
389 Review