I am _extremely_ happy with my custom UE 11. The noise insulation is actually not as thorough as it was with my old Shure E5c, but the sound is astonishingly good. The insulation is not too bad either - the thought of slapping a pair of noise-canceling headphones over the in-ear UE 11 crossed my mind briefly, but if you have music playing you don't really hear anything from the outside world, and when there's no music you're better off with a pair of plain old earplugs anyway.

I realize it's a lot of hassle to get, what with the ear impressions and all, and there's absolutely no way to try before you buy - and they're not the cheapest either, to say the least. But if somebody wants to treat himself nice, these earphones are not going to disappoint. I was like a child in a candy store, going through my music hours upon hours, weeks after weeks. All this after having been used to the admittedly very good E5c.