Well since I got mine yesterday my opinion has been changing on them.
Initially they were super warm and the bass was overwhelming and I felt like I got ripped off. Soon though the bass felt like it was down to a good level and the treble came out from hiding. It was then that I could really get a focus on the sound quality and a real feel for what I bought. I listened to them all day at work with music and Podcasts, I found that the isolation was excellent... so much so that I couldn't hear my coworkers! (This wasn't such a bad thing).
Something I found was that some of the tracks I love sound terrible with the JH16's and some other tracks sound much much better.
Lead Vocals: Front and centre, intimate like the artist is in your head singing, if the recording is poor the vocals will suffer the most.
Back up vocals are very clear and you can really hear what part they play in the song, for example Courage My Love has some epic vocal harmonies that really shine with the JH16's.
As far as instruments go....
Drums : Cymbals are sharp and focused, the kick drum you can feel in your head, and every tom hit is clear and evident.
Guitars: You couldn't ask for the guitars to be clearer and more accurate. The singing tone of a solo, the crunch and growl of an overdriven guitar, and the sound of the pick or fingers on the strings comes through.
Bass: The bass is a bit of a problem, it's hard to hear but as with most recordings the bassist gets pushed into a dark corner behind the drums and guitar . However when the bass can be heard it's just as clear as the rest of the band.
Piano: Sharp and clear, you can even hear the felt from the sustain pedal being lifted off the strings.
The JH16 will expose how well the sound engineer did his job as far as panning, mic placement, eq and so on. With a good recording it's pure bliss, you can hear the instruments pan back and forth,
there's no problem with the vocals being too forward or muddled, and nothing is running over anything else. With a bad recording you will hear every mistake magnified, if the panning is too close, the vocals are too loud or a track is slightly out of sync you will hear it. The JH16 has no sympathy for the weak and unprepared.
I have to say that the JH16 loves EDM and really exposes the perfection of a digitally generated sound track. A good EDM track really exposes how low the JH16 goes and will also show how accurate the JH16 is as it shows off every sparkling reverb trail. It also gives a solid base for how well the JH 16 handles it's sound stage. The stage is fairly close to your head feels like it's 2 inches outside your ears, but the depth and accuracy of the stage is awesome (It's like sinking into a deep pool of sound). There's no cloudy idea of where the instruments and elements of a song are placed, you know exactly where the artist/engineer wanted it. The Hell freezes over album by the Eagles is a really good example of sound stage and placement of instruments.
As far as how they work for a musician on stage, I can only give limited feed back as I had a scarce 15 mins to play with them on my drum kit. What I can say is that they block sound very equally, it's like turning down the volume with a flat EQ. I did however have to turn them up to about half way on my iPod to be on par with my drumkit volume, but I guess that's akin to standing in the middle of a hurricane and expecting an umbrella to block out all the rain.
Over all I'm impressed, blown away and absolutely in love with my JH16's. They really lift the protective veil on music, sometimes you see a hidden beauty, sometimes you hear something that isn't so pretty. It's very easy to lose yourself in the music since the isolation cuts you out of the world, I've found myself jumping once or twice from not hearing someone coming. They will never fall out of your ear unless you want to take them out, and are fairly comfortable for long listening sessions (not as comfortable as silicone).
What else can I say? I can't complain one bit about how much I paid for them $1300.00 CAD after shipping and ear moulds. I would say that the case (new round alumium style) is pretty bulky not something I would carry in my pocket (girls you've got the upper hand with a purse here). The mini jack has a MASSIVE over mould on it, so much so that I can't plug in my iPod for charging and the cable at the same time. Other than that I'm happy
. Pics later on...
you didn't say what was the cause so you didn't lie 
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