Zero B Purifier product quality has always been good what lacked was the service. I Bought a Zero B Purifier about 2 years back. Have been getting this services once in half year. The service used to come very slow till last year but I see a huge change in their service from this year.
They have started calling up as soon as the service gets due. Moreover once I registered a complaint on their FB page and it got responded in a day. I think ZeroB maintenance guys are becoming more service oriented now then it was before.
I hope the service remains prompt like what I experienced last month.