I have had an upright Eureka for several years and have never changed this filter. It's tucked away a bit behind a panel behind a canister and I always forgot it was there. After replacement, the vacuum cleaner sucks much more powerfully, and the air coming out of it smells much better. As far as I can tell it's exactly the same size as the original factory filter and fits snugly in place. This isn't a HEPA filter like the original, but it doesn't claim to be either. I would buy again next time I change the filter.