Hey man, I've got more words for you. Now, I've used my Primo 8s for the last 2-3 days with the following rigs:
1. iPhone 7 USB, Schiit Wyrd, Chord Hugo (DAC/AMP)
2. iPhone 7 USB, Schiit Wyrd, Chord Hugo (DAC), Schiit Lyr 2 (AMP; stock tubes)
3. iPhone 4s, Pure i20 (SPDIF out), Chord Hugo (DAC/AMP)
I also have a Schiit Bimby, but have not tried it with as the Hugo is just a jem. But shout out if you want me to form an opinion for it.
My usual 'everyday' headphones are Audeze LCD-XC, so the bar is pretty high when it comes to sound. I do not stand sibilance when it comes to sound. I did tried to compare the Primos to my old and rarely used Klipsch X10 IEMs.
Rig : All I can say the sound is great (no annoying characteristics), however a bit too analytical in the voice range. Voices really pop out and are super clear and detailed. I immediately noticed that I pick up what's actually being sung as opposed to listening to the composition as a whole. Drums sound great and very well separated. However, just like with voices it appears they are so well presented that it takes away from the whole of the composition.
Rig : The detailed character of the rig  is gone. They simply sound very well and I can't spot any obvious problems. Tubes?
Rig : It's like , but noticeably cleaner sound with more musicality to it. So, like , but more to my taste.
- Audeze is just more musical. The sound is alive.
- Primo 8 is more analytical then I would like to, but nothing to complain about. I think it comes down to the fact that they are fast responding IEMs due to the drivers nature. I actually listened to them several hours in one go and it was ok. With Audeze here and there you just notice they you want to play a song once again just for the sound. That's the difference.
- Klipsch X10s. Albeit good, I would pick the Primo 8s anyday. The Primo's feel like a complete no compromise package, whereas the Klipsch X10s immediately feel limited here and there although still good sounding. But certainly less impressive down below. I'd say the Klipsches sound a tad warmer...
IMPORTANT - COMFORT: With the foam tips the Primo 8s are wonderfully comfortable... I can't use no IEMs other than the Klipsch due to the size of the nozzle. It's typically quite big and just hurts my ears. The Primos are great in that regard - no complaints whatsoever. I purchased a pair of Zero Audio Carbo Tenore a few months back and just could not judge they sound properly as I could stand the pain. Just to give you an indication that the Primos are just great.
CONCLUSION: For $200 it's a freaking steal. I am not sure what else among closed head/earphones can be sounding that good. Unless you are after a particular sound signature. I am keeping these for when I need good isolation and portability.
I AM WEIRD GUY: I have just purchased 2 pairs of ATH-ES5 to complement my 7 years old pair... I just love the sound. They always impress me - reminiscent of the Audeze in this regard. So, if you like me I'd suggest you to try these. I got them for like $25 and these are nowhere to be seen anymore!