For a while I've felt with IEMs that somehow every resource I can use to figure out what I like - references, measurements, even listening to them - is somehow less reliable than it is with headphones. Stuff that measures similarly sounds different in ways I wouldn't expect, stuff that measures differently sounds similar in ways I wouldn't expect, and sometimes the things I notice when listening somehow don't seem to determine how much I like it, even when they would for headphones. The comparison with the Timeless and the Zen Pro in the review reminds me of the last time I compared two IEMs for myself, both cheaper than this one - the Aria (well-liked here), and the Yume (well-liked elsewhere). Sonically the Yume had some flaws relative to the other that I could pick out, and then over time I decided that it sounded better, even though every consistent sonic difference I could isolate and describe seemed like a negative. Honestly sort of confusing to me. Could be that I don't have enough perspective, but I can completely see hearing like 10 different problems with an IEM relative to another one, and then still preferring it head to head.