The hpa is a welcome addition to my setup, and I appreciated theaudiostore's quick delivery.
I would've given it 4 starts if I had the other cheaper models to compare with and found the difference negligible, but since I don't - and am happy with the device - 5stars.
Update : Love the sound.
In around two-three weeks of portable, perhaps rough pocket use I found the braided wiring to slightly come undone on one end, confirming my suspicion of the cables being a weak point of the build (in image I am intentionally pressing together the cables slightly to emphasize on the issue). I decided to remedy this by stitching a cloth sleeve over the cables, trading in the cable's flexibility for sturdiness. 4 stars - they should've come out of the box more durable.