I became interested in high-end audio in the 80s when I was twenty-something. Back then there were primarily two schools of thought on audio equipment: The first group claimed that you can tell how a product sounded simply by looking at scientific measurements. Most equipment sounds the same (at least within a specific price category) and differed only in features (Audio, Consumer Reports, High Fidelity, Stereo Review) VERSUS the Second group who claimed that they were inherent differences in ALL audio products. Products with the same exact measurements and specs will indeed sound different. In addition, there are internal and external variables (room placement, source, cables, materials, associated equipment, etc) that will affect how a product sounds. The best way to determine how a product sounds is by personally listening to it within the environment of intended use (Absolute Sound, Stereophile) . Since I heard differences (good or bad or just different) in audio products, I went down the latter path, but I remained cognisant of the Law of Diminishing Returns, perceived differences, the psychological effect of auditioning a $20K amp, and High--End Audiobabble. Nothing fancy but my Adcom, California Audio Labs, and Vandersteen kit was far more satisfying than the typical equipment found at the local consumer electronics emporium.
Specific to the AAW Capri DAC Cable, I offered my mini review earlier earlier in this thread. To my ears and musical tastes, using the iPhone 6S Plus as a source, I found the Shure LTG better than the Capri which I turn I found better than the stock Shure cable that came with my 846s. I discussed what types of music I listened to (EDM, Alternative, and Adult) soundstage, hiss, bass, etc. Choices in all-in-one cables with built-in DACs, iPhone compatibility, and Apple MFI Certified Lightning connectors are very limited. So from my perspective, the Shure LTG provided me a real world solution to my commuting needs. If extracting the absolute best possible sound from the iPhone is your goal, you can only do so by using an external amp/DAC.
another option is Noble's lightning cable. 
