I have been using a brand of local water purifier but since the time I bought zero b RO purifier from their site in march this year I have started seeing the difference. Its been over 8 months. No trouble free. I had bought it after seeing the demo n a water test at my home.
I think I bought it directly from the company reps and with amc. My experience of the service support from company is quite good. at least they have been calling me for feedback Though a bit expensive but it is worth it. I guess.