First-off, I'd like to extend a big thank-you to Hisoundaudio for the review sample. It's not often that you find a company gracious enough to let you not only sample something, but actually keep it. And I'll start off by saying that I'm thrilled they let me keep it  Onto the POPO IEM. A bit of a strange name, granted, but this is a bit of a unique product. I'll step through the packaging/accessories, then talk design, fit, and build, then move onto sound.   NOTE: Included at the end is a TL;DR section for those of you who don't feel...