My portable system ( A&K SP1000SS + SHURE KSE1500 + MandarinES Symbio N eartips)
just got upgraded with a BRIMAR 16x cable.
The sound change is subtil (the Labkable is already a very good cable), but noticeable :
It cannot really be described by terms such as "better bass" or "better soundstage" but rather by "more emotion in the music" and more "be there". I know this is not very scientific terms, but this is how I will describe the improvement.
The result is more "musical and enjoyable, with a fuller sound and (may be) more details"
So the improvement is noticeable, but... I can't honestly say that it is worth the price difference because of the very high price of the Brimar 16x.
Note: the BRIMAR cable has direction which have been preset during the cooking process: the 3.5mm connector with BRIMAR's logo is recommended to plug into the source side