Have a Rongxin 89DV for six months now. It sounds really, really fine when its working. Me and my friends who have friends who have heard it are equally impressed. Ang problema lang is sira-in talaga. First week pa lang, sira na yung subwoofer so I had to have it repaired. A month ago, I've noticed medyo imbalanced yung sound, tried checking what's wrong. Wala pala sound yung left front speaker nya. Problem is subwoofer na naman.
So I guess suerte-suerte lang. But I suggest if you have money and you want something more long term, bili na lang kayo ng mas branded na sound system.