The bass can be boomy at times on the Portapro. I prefer the sound on the Sennheiser PX100, Koss KSC75, or Koss KTXpro1. For those who do like the Portapro sound, the Koss Sportapro sounds almost exactly the same as the Portapro but looks different and is around half the price.

I've been doing a lot of listening on my PortaPros between the demise of my Sennheiser 580s and the arrival of the replacement 600s. While they are not in the same league as the Sennheisers, I think they provide surprisingly good sound for the price. If you are looking for a set of inexpensive portable phones, these are certainly worth an audition.

I just wish I have more higher end to say it like this. ^ But I can't help but still be amazed with it, for its price, even as I climb up the price range in this hobby.
Besides, in the grand scheme of things, they are peanuts money, relatively, once you are rolling deep into audiophile-dom.