I posted earlier in this thread that my Heir 4a customs arrived, but I had to send them back for a refit. Now they're back and fit perfectly, and best of all they sound amazing. They're extremely neutral and accurate, so you only hear the song as it was intended to be (i.e. you won't hear more bass than than the artist put in the song), and I'm hearing details in songs I haven't previously heard. If there's one downside, it's that headphones with added warmth or kicked up bass can hide the flaws in lower quality recordings, and the 4a's won't do that. To give an example, a magazine can hide a model's flaws by airbrushing, but you're not getting a true picture of what the model looks like. The 4a's, however, present that true picture, but in return they need to be fed high quality sources. Thankfully most of my music collection is high quality mp3 and flac files, so this shouldn't be an issue.
I attached some images so you all can see what they look like. IMO, Heir makes the best looking IEMs, as the faceplates are made of handpicked exotic wood (I chose "afzelia burl" for mine).

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