I was looking for a better BT headphone for travel, as such portability an ANC are important. I owned a Sony WM 1000 XM4 and while the ANC is excellent, the sound quality did not impress me. The sound is rather muddy, the lows and mids not being well separated. I hear mostly classic and Jazz music and I don‘t like heavy bass.
I went out to some hifi stores in Germany, one of them HiFi Klubben in Hannover (great, supportive people there). During travel, I use a Fiio M11 Plus Ltd. player, listening to imported music from Qobuz.
Just before going to the hifi stores, I learned about the new Dali IO-12, I already use Dali Opticon 6 MK I loudspeakers, so I was curious about the IO-12. Unfortunately, HiFi Klubben could not provide the IO-12 on time, so I had to chose between the BO H95 and the BW PX8. I preferred the sound of the PX8 and because the H95 had difficulties connecting reliably with the Fiio Player, I purchased the PX8, which I liked so far.
At HiFi Klubben in Munich, I had the opportunity to finally compare the PX8 with the IO-12.
And I agree with the other posters, that the Dali IO-12 has a somewhat better sound, but to my opinion not as much as I would spent nearly double the money for it (I paid 528 € for the PX8). The IO-12‘s soundstage is wider, and the vocals clearer and a bit less sibilant in some recordings, however, the separation of bass and mids did not impress me, there are not much better than the PX8.
The IO-12 is a bit more comfortable in wearing, thanks to the larger ear pads, however, the PX8‘s comfort isn‘t bad either. The passive isolation of the IO-12 is better, but I found the ANC of the PX8 little more effective.
However, the dealbreaker for me was the huge and thick case. Sorry Dali, but for travelers, this is a no go. It only barely fit into my business backpack (designed for 15 inch notebooks) so this was clearly the end of the story. I think Dali should try to develop a kind of IO-8, which is more compact, but with sound close to the IO-12. That would be something, I would consider to buy.
As of build quality, I was disapointed for the price tag of 999 € as well. The PX8 has a much nicer finish and design, the IO-12 looks comparatively cheap, although the leather is really nice.
So these are my thoughts on the Dali IO-12. Definitely a nice headphone with great sound for a BT device, but not for a traveller.