I listened to these at HeadFest, along with SE530, Westone 3, and the LiveWires universal-fit demo.
Notification of bias: I am an Ety person, through and through. What I personally would seek from IEMs like these would be clarity, range and neutrality that are like an Ety only more so.
By that standard, which I know is being far from everybody's, the Triple.Fi was my least favorite of the IEMs mentioned above. I would describe it as having very extended range, with powerful and for me overprominent bass, and treble that was not only extended, but extremely prominent at the top end as if to hammer home a point about just how high the treble goes. It was the sort of thing where you feel you hear every tine of the drummer's brushes as each impacts a cymbal one by one. If you've ever heard an Ety ER-4B, it was a little like that. In comparison the mids were much too far down in the mix for me.
My test track was vocalist accompanied by piano, acoustic bass, and drum, in a live venue. With the Triple.Fi it was more like bass, cymbal and snare accompanied by, in descending order, pianist's right hand, vocalist, and pianist's left hand. I'm not trying to be mean here, I'm just saying it really was a shift in perspective from what I hear with Etys.
The Triple.Fi seems like it would be great for types of music where groove and tizz matter more than mids and vocals, but that's too far from my own listening for me to comment on it critically for that purpose.
Of the others I liked the SE530 the best, the Westone close behind, and the LiveWires pretty well but for me a very clear third behind the others two. None pleased me enough to displace my Etys, but that's much more a matter of my tastes than of any real quality problem with them. I think many people will love any of these, and I think the Triple.Fi simply tries to go a somewhat different sonic direction from the others, one for which there probably is a market.