Pros: Natural, airy, unhyped and detailed
Cons: None...except they'll make you realize just how bad MP3s really suck. But is that really a con?
I've had these for about 6 months and I find them to be outstanding. I think you'd pay double to get anything better. Natural, unhyped response. Nice full soundstage. VERY, VERY COMFORTABLE. I use them with a Fiio E10 as well as a Focusrite TwinTrak Pro. I have quite a bit 24/96 and vinyl. For reference I also own AKG K240M (600 OHM), Sennheiser HD439, Superlux HD681 and AKG K55. The 598s are by far my favorite, no contest.