They aren't perfect, HFI2400 is a very good headphone but can be very sibilant with certain songs.
the airy design huh :/ but then again. i heard the 2900 and 900's also had some sibilance with them. Hmm, i'll be dropping out of the heapdhone market for my next purchase :)
Ultimate Ears Triple Fi 10 for me :)
yeah i feel you. my shure's aren' mad bringht. but tend to get a bit harsh in the highs sometimes. not too harsh or annoying. just a bit. it's also quite brightsometimes. the siblance...omg...sometimes the sibilance jsut kills you. that was at 500 hours of burn in. it's been 600 now. the sibilance horrors from the past 100 hours or so are thankfully all gone.