Well, the ZST was a cheap solution instead of the vsonic VSDs.....the VSDs were perfect, in terms of comfort and sound quality....the only thing that 3 out of 3 got fatal driver problems just right after the warranty period, they simply fell apart.....just doesnt worth the price, almost 200 bucks thrown out of the window....I wasnt expecting the same quality as the vsonic, but for example the cable quailty is one thing bugs me off every time, the ZST cable seems to be too "sticky" and unflexible, plus the hardening at the driver - cable connection part on the cable is terrible.....couldn't make it fit properly around my ears, always stick outside to some extent.
The driver / house seems pretty cool, but the eartips are just terrible, it automatically moves out of ear my after a while, and will definitely do so during gym-time (despite of not running around for hours.....) so that's all about the physical thing, but have to admit that I like the feeling that the house is not totally empty, you can feel that it is sturdy and stuffed with materials, the problem is that it is not neccessary reflected in sound quality. It is a too harsh for me, with too much and unclear mids and highs, and the overall stage effect is just well behind even the vsd1/vsd3...I know, might not be a fair comparison, different league...I did not experience too much with the bass because I'm basically a zero-bass listener, I never add any besides what is normally included in the pre-defined presets.
SO, to me it could be a decent IEM, if the cable is changed, and the eartips are changed, and soemthing is done with the overall quality....at least some improvement, or fine-tuning of the sound shape.
Urbanfun surprise me even more with their elegant versatility!
