Hey there, I were sent here to throw in my recent experience with my 1964 quad driver customs. Before these I owned a set of UE Triple-Fi 10v and after waiting for 2 long months I finally got these - Initial experience: Wow, this is....Bad. They didn't fit and didn't really sound amazing (coming from the Triple-Fi's that is).
Now about a month later things have changed slightly: Left IEM is suck a loose fit that it lets outside noise in, by such a degree that with my left ear i can hear clearly if i turn the music off - and this is obviously both uncomfortable and disturbs my listening unless I'm in a quiet room, i which case i would use my full-size cans, rendering these (Left side) useless. The right side fits..BUT! the cable connector is pressed hard against my ear so it hurts a lot over time. All these cons pretty much overshadows the sonic improvement to me - They've got that bit of bass I wanted over the rather dull triple fi 10, but even so, i now find that in lack of my fullsize cans i tend to use my vintage pioneer SE L40 for fullsize and a pair of skullcandy TiTan as IEM a LOT more than the customs...Thats right, a skullcandy crap-bud may just have almost beaten a 800$ (with tax etc) custom IEM, simply by actually doing its job without torturing me at the same time.
And from all the cases of wasting endless sums of money and time on refitting I am inches away from just trading these for a pair of Westone 4 if thats even going to be possible. My custom adventure may just have ended before it started - Its going to take a LOT to make me want to spend money on custom IEMs again.
I am really sad about this, but that how things are.