I recently got the 7Hz Salnotes Zero myself. I had been using KZ-ZSN Pro X before that. I immediately thought the Zero was too bright though it was slightly better in many other aspects from the ZSN Pro X. It kind of grew on me and has become my primary unit when I go on my walks, etc.

But the comfort? Ugh. I have large ears and it still hurts my ears unless I insert it at a specific angle and pull my earlobe down while doing it. My glasses pushing down on the wire or any cap touching the wire, or god-forbid, pushing the earpiece even slightly so causes it to hurt. I have mastered the art of inserting it so it doesn't hurt but man, if I am in a hurry, my ear gets sore quickly! Makes me wonder if I am doing something wrong...