Ever since my first air cleanser broke down last year, I have been looking for a good replacement. I agree that the number of air purifier types that I can choose from isn't as huge as the number of gadgets and smartphones. (thank God it is not the case) 

But even with the options that I had, it was still hard to make my pick. I know from the beginning that I want a compact cleanser, but I am divided between Honeywell and GT50. 

At last, I made up my pick and I eventually made my purchase. Since I have only played with it for a couple of days, I can't be 100% certain but I believe it was an excellent pick.