Have you compared the PSB to others in its price range, or have you owned any others in its price range? For $400, I doubt it'll best such highly respected headphones as the Sennheiser HD600, Sony MDR-Z1000, Hifiman HE-400, Shure SRH1440, Grado SR325i, etc.

I listened to the PSBs as well and was pleasantly surprised. They sound almost as good as Ultrasone Signature Pros with a similar signature, but the PSBs don't have quite the bass punch, presence and depth. Not bad considering the PSBs are one-third the cost of the Ultrasones.