Peresonally I am from urban area thatswhy air is not very clean. I am also suffering from pollen allergy. I am not going to compare this with anyone but just share my own views.
I bought it from snapdeal by spending some bucks in month March. till this date it is performing well also very easy to operate. Design is also very impressive as very easy to carry and move.
Main thing I like about it is that consumping less power but provide more efficiency in every type of condition.
Result is that now am fit and healthy. Also hats off to the service support of company which is very helpful and fast.