Porta Pro blues
In my experience the Porta Pro is uncomfortable. Their two-position settings for earpiece pressure would not lock into place or me. For my purposes -- listening while working out in a gym -- the Sennheiser PX100 was much better.
I agree with the poster who discounts claimed freq reponse. In addition to his point about dodgy claims, let me add this: you might (by age, excessive exposure to high volumes, DNA) be incapable of hearing certain frequncies, so theoretically better ratings are irrelevant. Especially those highs.