The build quality is quite good actually. It will last many years without issue, the cable and headphone are much sturdier than they appear. My personal gripe about them was actually the sound quality, they have a sound signature I love and I find them musical but sadly they were too grainy for my tastes and didn't upscale as well as my other headphones.
I think ma900 was engineered in a way that it sounds as advertised & consistent wherever you connect it to.
I have tried it all ..... home stereo receiver, iphone, kindle hd, a laptop with built in realtek hd dac and another laptop from nearly a decade ago. The sound signature does not change at all.