I agree on ear buds as lousy portable phones in general, as most I have tried seem bigger (and painful) compared to the Yuin shape. Sound-wise, the Yuins outperform many IEMs/canalphones, and all three versions really scale up with the right amp. I use PK3s for a couple of things. Walking on busy city streets, where I need to hear horns, etc., and in the poker room at the Borgata, where I need to hear the sounds of the game. Otherwise, I'm strictly IEMs or the Grados. The OP said ear buds, so I tossed out the Yuins as a counter to that generalization - which, for the most part, is accurate, in my view.