This is air filter good?
Atmosphere® Air Purifier
This predominantly NE Singapore haze episode seems bad due to the very high levels of smell attached to the smoke particles (relatively speaking, the PM2.5 concentration is not super sky-high relative to the high levels of smell).
Seriously speaking, you don't need to spend that much for haze prevention prep.
If your aim is just to bring say PM2.5 50 - 100 ug/m3 concentration range down to say a very very breatheable 5 ug/m3 in your room in 30 mins, even a Sharp A28 with its 168m3/hr airflow and stock H10 filter (85%) will do the job in a 15 sqm MBR within 30 minutes. In fact, 5 ug/m3 is pretty clean air, this air quality is equivalent to the cleanest days you'd get during end Dec 2014 to late Jan 2015.
But I am not saying that this basic Sharp A28 model is suitable for everyone even though it'd do very decently for the majority of conditions experienced here in SG. This is coz even in fan speed 2, it is somewhat noisy and probably unacceptable for very light sleepers. The energy efficiency is also below average. But for prevention of transient haze episodes, this is good.
For bigger halls like Mansionettes/Penthouses, we even have the $200 Xiaomi, which has 1.6X more cleaning power than your Amway.
For those who are more health conscious (more and more studies point to air pollution impacting our lives) and who are into healthy living, healthy eating.....hence needing something that he/she would use daily for a good 10-12 hours, then yes you'd go for a model that has a more refined edge.
Mid priced models include those in Sharp, LG, Samsung, Philips, Coway....and go all the way up for models offered by IQAir, Blueair, Austin Air and of course your mentioned Amway.
To give you an idea, if you were to plonk a Samsung AX40 into a typical 4/5 room HDB master bedroom of say 16-25 sqm....you are looking at ZERO ug/m3 on the laser particle counter within 30 mins of operation for the typical 50- low 100s ug/m3 concentrations that we face. Even for June 2013 haze, no issue at all, just would take a wee bit more time and maybe hit a bottom threshold of say 1 or at most 2 ug/m3 concentration due to "room leakage". In fact, you'd be more like looking at the number of particles per Litre of Air, really going down into such minute ranges that it doesn't really make much of a difference in real life even for those Sensitive Group who have medical risks. Just mere numbers and statistics
So choose your poison depending on your personal budget and needs.
PS. For NE China and the sky-high PM2.5 concentrations that they get, that's another ballgame. A Samsung AX40 type of AP shd be common purchase even for a small 15 sqm bedroom. Coz their AQI peaks range from 600 all the way to nearly 1000 (!!!). You get what I mean?
And you know, last year (or the year before last year), 7 million deaths were attributed to such high levels of air pollution.
). But this morning she was quite excited, she told me when she came out to mix milk for the toddler, the smell was absolutely terrible that she had to close the windows for the kitchen and living room (actually she doesn't have to, all the 3 rooms have air purifiers, MBR actually 2 coz got toddler 
