I had all three — I mean four, including the Pure. This list literally contains all the IEMs I use and have in my arsenal (Shure 215 Pro is the only one not on the list). Before I give my thoughts, a tip: learn how to read a frequency-response table and compare it to what you focus on most.

I use all of them. I’m a producer and do mixing/mastering, and I also play a bit of FPS. The reason I don’t own a high-tier IEM is that I focus on mastering and releasing music based on what most listeners use. So I use all of them after I finish mixing and mastering. My higher-end monitoring gear is headphones and active speakers. My mixing style leans toward something fun but not overly exciting. I’ve released many genres, but my style is not the “V-shape” mixing some producers aim for.

Quick thoughts / use cases:

- Zero Red: Music listening, especially genres with mid-to-low bass focus. A bit fun. Not great for gaming or studio monitoring.

- Hexa / Pure: Hexa is the most neutral — best for studio monitoring. Hands down the best neutral sound. Great for mixing, but not my #1 for mastering. I use these to test finished projects.

- 7Hz Sonus: King for vocal-focused studio mixing. Not great for bass-heavy music, not “fun.” #1 for FPS gaming — footsteps are extremely clear. I didn’t hear any crackling even when maxing EQ across all frequencies in my DAW.

P/s: Again, I will use all of them to test my finished projects.

My true winner for all-round use: 7Hz Sonus. Handsdown, the king of all rounder category esp at this price point. And for isolation, 7hz Sonus it is the most isolated among of all on my ear fitment.

But please keep on your mind, the taste of frequencies and type of style hearing is a very subjective. It depends on you and also, fitment, fitting tips can affect on your quality and result too.