I had both and I must say, the W2 is much better, I agree that the sound signature of the UM2 may be more appealing to the most, but the W2 is a state of art dual driver where the UM2 is just old, W2 is technically clearly superior to the UM2.
The seperation, the detail, the soundstage, the definition, the well balanced sound----> W2
the Fun, more mid and upper bass, inyourface sound---->UM2
take a W2 and add about 6 dB in the Bass and you won't miss the UM2.
I prefer the W2 over Shure SE530,Triple Fi 10 and Westone 3.
Edited by Nestroit - 3/16/12 at 6:08am