HI tan, i'm thinking of getting the UE6000, what are the problems?
I've owned the UE6000 from Feb 2014 and there are a couple of problems, but at the price of $70 that I got them at, they were well worth the purchase.
First up, the noise cancelling module can run into problems. In use, there is a constant 'hissing' sound. The effect of the noise cancelling on audio quality is already well documented on this forum but suffice it to say, it has a net negative effect on audio. Though honestly, I barely use noise cancelling as my headphones have been only used at home. Also, if you use the noise cancelling, be sure to completely push the switch either on or off- leaving the switch in between for me has resulted in the headphones not working (i.e no audio comes through at all, which has scared me on a couple of instances).
I've also started to notice some issues with the durability. There have been a handful of occasions when one of my cups has failed to project audio, with the first occurring approximately after 6 months of use. This problem for me is not an issue with the detachable cable, but rather the internal wiring of the right cup. When these instances have occurred, I had to jiggle the headphones a bit to resolve the problem. This issue is quite disheartening as I take pretty good care of my headphones- they haven't left the house once. If anyone could give some recommendations as to how I could reduce this problem occurring, I would be very appreciative. This problem is what caused my previous headphones to be unusable.
Apart from this, the only other problem of note is creaking. This occurred after 4-5 months of use. It's bearable for me. A minor problem.
Also, not sure whether it's just me, but I feel as if the right cup has less noise isolation than the left? I've gotten used to it, but it was one of the things that I immediately noticed.
Sorry for the late response, just be wary of these issues.
Hope I've helped! :)