I've had some UM2s for many years and have always been happy with them. Recently I managed to break them beyond repair....
Since I need some new phones, are the UM3X a worthwhile upgrade over the UM2s?
My sources are a 1st gen rockboxed nano for out and about and at the gym and a FiiO E7 connected to my PC at work.
I listen to everything from The Berzerker to Jamiroquai!