FA-003 have one of the biggest soundstage I ever heard.
It is bigger than open headphones soundstage.
Well balanced pleasant sounding ,you can listen to hours and hours.
Not as detailed or agressive as Ultrasone. No darkness. No forward ,close or inside head sounding.
I think it is best with classical music.
It is very comfort. Big cans. Very very deep (guess one of the reason for huge sondstage). Rubber coated outer finish. Medium cans pressure.
If I listened to orchestra ,opera or something else that benefit from big space sound I definitely would buy it. FA-003 sound twiсe its price IMHO.