Great adapter and sound quality.
I have a Schitt Jotunheim but was waiting to buy balanced cables until I upgraded from my Sennheiser 598 and Hifiman 400i to a more expensive headset. However, once I saw that I could get this adapter and an Earmax cable for $40 combined, I decided to buy both. I thought "it won't make that much of a difference but at least my curiosity will be satisfied and I won't keep thinking about it." Boy, was I wrong!
I listen to a lot of trance, industrial, and classical music. As a norm, I would use the 400i for trance and industrial and the 598 for classical due to the 598's weaker bass. This upgrade has made listening to both of those genres on the 598 possible. The bass hits harder and has this great depth and body. In addition you can hear a lot more detail in the music. Heavy layered songs like Embracing Entropy and alt_Human from Circle of Dust reveal a lot more textures and additional harmonizing background vocals (previously unheard) from lead singer Klayton.
On the classical music front, I am hearing instrument separation, positioning and instrument textures a lot more clearly. Pieces like La Mer (Cleveland/Boulez), Scheherazade (CSO/Reiner) and Pines of Rome (Minnesota/Oue) sound glorious. It actually has distracted me while writing this review since I'm hearing so many new details and stopping to appreciate the flutes, harps, trumpets and other instruments.
Do yourself a favor. If you have a headphone that can be run balanced, pick up this adapter and a compatible TRRS cable and upgrade your sound. You will be glad you did.
Would recommend to a friend.