We purchased our 1st X8 during the severe bushfires in Australia in early 2020. The unit very effectively dealt with the terrible smoke pollution. As I have COPD, air quality is essential. We have now purchased a 2nd X8 and the smaller X5 unit. They are doing a great job. The only issue is the incredibly high cost of delivery to Australia at $800US($200US in 2020) however perhaps the cost of not getting these great units would be far greater.