Are all of their headphone models awful or just the lower end models? I know that most of the reviews I've heard are of the lower end models and they are prett

Are all of their headphone models awful or just the lower end models? I know that most of the reviews I've heard are of the lower end models and they are pretty much universally panned as a fashion accessory. However, the high end Beats headphones seem to be pretty good; well built with a flat response curve.