Got this cable for my 64Audio U4s, as flat 2-pin cables are not very common (most companies only ship cables with standard recessed 2-pin connectors, which look funky when paired with 64Audio's protruding socket assembly). The cable itself is relatively well-built, although the injection-molded plastic around the y-split does have some bit of fraying, and the plug does have a small, shallow dent. The wires itself are pliable, soft, and don't tangle. The ear hook itself is quite thick, but still comfortable. The fit and feel of this cable is significantly better than 64Audio's stock cables, which actually cost more (retail).
Sound wise, the U4s is definitely better than 64Audio's stock "Premium" cable (SPC material). It has a slightly poofier bass response, with more meat, but less control. The mids are relatively the same. And the treble is slightly more laid back, in that it kills some of the brightness/harshness the U4s, and many other tia-equipped 64Audio UIEMs I've heard. In general, it makes the U4s more palatable for my tastes.
The most surprising thing is that this sub-200 USD cable ships with a personalized card that has the owner's name hand-signed upon and a grey leather case, something lots of other boutique cable companies fail to do, especially with their entry-level products.
