I'm using puricare product now (not only water purifier, but also water softener). We've made a lot of comparison on the price, quality and the filters that are in the machine before we buy. Of course, nowadays, more people realise that the Korean quality has improved very much, look at LG, Samsung, Hyundai. My machine is using membrane which is very different from the rest of the dispenser (mostly are only filters) in the market.
My family is very satisfied and comfortable with the quality of water especially my kids. We find the price also very reasonable as compared to its quality unlike Diamond and some other make which is very expensive.
Cheers...