The filter becomes clogged very quickly in my case (full apartment in floating floors, suddenly "moumoutes" dust which clogs the filter) and thus requires cleaning after each use. Not sure it's possible to do better with this system though.
Regarding power, it is used in the car he will have to be patient, and provide multiple passages.
Another thing: non-replaceable battery, the product is "disposable" so ...
Overall, I am disappointed by this.