It's like there's a warm electric haze infused with every note, especially Rock. Some say it's too much, but I think it's a perfect specialist IEM. Upper mids and above aren't super detailed or prevalent but that's more feature than flaw. Twilight isn't designed to do everything well (shout out to Dita Ventura... I love you), but it serves its purpose perfectly. And they're pretty comfortable, praise be.