We bought the Dyson purifier with fan and heater recently. We live across the road from the Perth airport and a busy 6 lane highway. The dust in our home is worse than normal because of this. We have the purifier in the main bedroom and the change in the amount of dust is unbelievable.  I'm also not waking up so stuffy in my nose. The fan is strong.  A little more noisy than I like but powerful.  We haven't tried the heater yet. Overall we think it is definitely worth the money.