Own the PortaPros and they are okay. A bit muddled in the mids, bass is sloppy, but hey for $50 it works. I've not listened to the Grado iPhones, must be better. I spent a lot of research on an iPod phone and settled on Sennheiser 238s. The real deal with great bass, open mids and highs and real comfort. Larger for sure, but great cans.
