Just finished listening to Ott - Fairchildren with the 109 Pro and wow, what an absolute delight! I've heard this album through probably 20-30 different headphones and IEMs (at least half of which were more expensive than the 109 Pro), but hearing it through the 109 Pro really grabbed me for some reason. Such great punch, plenty of sparkle, just a great experience.
Funny thing is that I had just followed it up by listening to the same album through the DCA Expanse and I was not nearly as impressed. Sure, I'll bet in reality there were more details, bigger soundstage, etc., but it just felt like some of the energy was missing. There's just something different about the 109 Pro. It's addictive. It's engaging. The dynamics of the album (Fairchildren) really match well with this headphone for some reason. Just another example of the fact that there is no "best", only "different" in this hobby. Glad to own both headphones, but the 109 Pro is capturing my heart at the moment.
EDIT: It makes me recall something that a friend of mine once said. He said, "I don't really listen to headphones. I'm a speaker guy". What he meant was that he preferred the dynamics, the impact, the physical nature of hearing the speakers and subwoofers pressurizing the room, something that you can feel as well as hear, as opposed to just listening passively to the music. Headphones are great for digging deep into the music, dissecting it and "hearing things you haven't heard before". But they can't match the physical dynamic impact of a big set of speakers. This is a little bit of the sense that I get with the 109 Pro. Yes, there are many other headphones out there that have terrific impact, huge bass, etc., but the 109 Pro does it with more finesse and refinement, in my opinion. Add to that the comfort, light weight, superb clarity and texture, and relatively inexpensive price of admission, and you've got a winner.
EDIT #2: Just listened to several Phutureprimitive tracks through the Expanse and oh my was it a terrific listen. Super immersive, huge depth and space, with incredible detail and balanced tonality. Just another example of not being "better", but just "different". The Expanse wasn't a great match for the Ott album, but is a tremendous match for Phutureprimitive. Great times that we live in, where we have such a wide range of choices for audio equipment matching. Just wanted to follow up with my previous post and close the loop by giving some love to the Expanse. Dan really developed a super flagship headphone, but it comes at a price. Relative to their respective prices, I put the 109 Pro and the Expanse right at the top.