I've been searching for a nice wireless open-back for a while. I prefer the sound stage for lots of music while using open-back headphones--especially classical, jazz, and Afro beat. I use the HD600s, HD560S and Hifiman 400SE while wired, but wanted a similar experience while on WiFi or utilizing USB-C audio. They're not perfect, but they have a lot of punch for an open-back. I don't care about driver count, but this is a decent implementation. There are a few treble spikes in default EQ, but it's still decent. Balanced loses the punch, and bass boost mode is a little bloated. Custom EQ Durant responds as I would like, so I just keep it on default with no issues.
I'm surprised that JLAB came out with this concept and I expect others to follow suit. I'm happy with the purchase. They won't replace my wired sets, but they're a nice option for open-back sound while on the go or away from my DAC/amp or DAP.