Thoughts on the Xiaomi Air Purifier 2S, replacement filters, where to buy etc.

Hi,

I'm currently in the market for an air purifier and the 2S caught my attention. I would like to hear from others who have used the 2S or other air purifiers from Xiaomi about their overall general opinion of the product and the ease of buying replacement filters (since it doesn't seem like you can do it locally in Australia), as well as the hassles (if any) of purchasing an air purifier outside of Australia. In addition, are there any sites that you can recommend and sites that I should avoid?

Thanks