I'm very happy with this Xiaomi Air Purifier, I've had it for a few years now. It filters very well, I run it all year round. The replacement filter is not exactly cheap, but you can delay buying a replacement filter if you vacuum around it from time to time. The Air Purifier shows you when the filter needs replacing.

I bought the Philips 8000 series AMF870/15 (70 m², 40 W) better than the Xiaomi pro H because you don't get any filters.

We have one from Xiaomi. Are satisfied with it
Xiaomi Mi Air Purifier 4 Pro