Well, thanks to a random encounter with a pair of headphones on Shane's table, I am finishing my headphone journey.
There were these blue and silver headphones with triangular shaped ear cuffs that caught my attention.. "Those look nice!" I thought... We had a play date for our boys and were looking at opening some wine so I wasn't there for hifi but.. there was this opportunity!
Shane has picked up ADL as a line to carry. These were the
H128's, their more refined entry to the H118's. I tried them, listened, and thought, wow, these sound exactly like what I'm looking for.. a more refined musical headphone than the Momentum. They still have the bass oomph but with detail... and more refined, pronounced mids.
Using my phone, I could hear a lot of little nuances, but also better imaging and instrument separation. These sounded very airy and light... and somehow imaged outside of my head. It was really like someone was singing in front of me! neato! Plus, no major fatiguing or weird peakiness in the highs.
I took them home to 'break them in' more as a service to Shane, because he needed help with that particular task.

I was really enjoying the sound but I could tell the H128's would benefit from an amp vs. straight from the phone. They're 'fine' without an amp but they got a little congested during peaks.
I learned ADL started out by making a little USB DAC (the X1).. after that, they got into headphones. So, I thought it must be pretty good and asked Shane about it. He had one! (of course) It's very light and tiny (slightly smaller than a deck of cards). I had already committed to buying a Lambert tube amp... but it hasn't shipped yet.
I wasn't thinking I'd like it.. but I do, especially on the ADL's. On the Momentums, it reveals more of the issues with Momentum's... such as the smily face EQ'ing.. Seems like there's a 6+db boost in the 40-80Hz area and a 3db boost on the 5,k-8,k range on the Momentum's. That sounds pretty good/fun/musical straight out of the phone. I'm a little spoiled on the H128 refined sound.
I did get a brief chance to hear the 118's at Shane's and they sounded very good as well.. but I didn't listen long enough to pick them apart.. overall, I would recommend them to anyone.
If I could go back, I'd buy the 118's for work and the 128's for home. The 128's most accurately reproduce what I hear in my sound room that I've heard so far and therefore make the music very approachable and instantly engaging.
In any case, I'm now breaking in the X1 and the H128's and will report more later when it's finished changing... and so far I would say it's dramatic changes, but there are some every time I listen.
-C
PS This was my 3000'th post! Woohoo!