I also didn't like the UM2, but I don't agree on the rolled off highs. I thought they had some sparkle and they were quite extended imo. But the mids, oh my god, these are recessed and that's a big understatement. Bass is boomy, thick and it just blurs everything else. They did sound like the E5 which is no surprise, and I'll definately stay away from the E530. I can describe the UM2 as warm, laidback and blurry. My super.fi is the total opposite, it's cold, upfront and crystal clear.
The comfort is a big letdown also, the shellcase is too big, it touches my ear and because of the basic plastic it starts to hurt after a while. I hate the cable, it's too thin, too flexible (way inferior to the Shure E1) and you can easily cut it. It hurts my outer ear also. It's weird, cause almost everyone finds these comfortable, but I think they are on the bottom of the list of comfortabilty. Super.fi 5 Pro is waaaaaay better and sits on the number one spot of all the IEMs I've owned. No matter what tip I used, the sound never changed, neither did the comfort. I would be weird to hear a (major) change anyway just by using a different tip, must be magic I guess.