Yeah, I had them on the HF1s. It's really a comfort and soundstage versus more balanced (for a Grado anyway) sound choice. Things were more distant and blurred (or at least dulled) a bit. In comparison with other phones it's not a crazy difference and I went back and fourth, for usually large chunks of time, but if I did it all over again I'd avoid them. There are of course other mod options, but I'm not sure any avoids a SQ sacrifice. In the end I'd probably suggest a different phone if comfort is an issue.