So the other day I went to my friend's place and brought another head fier to test his collection. The friend who was the subject of the tests normally uses a moondrop IEM and a dongle dap as his daily driver, so he is a casual head-fier. In addition to the HPs pictured, he got to try Diana TC, LCD-5 and DCA Expanse. Sadly I didn't bring my AC that day. The system was a Gustard R26 connected to Cayin HA-3A powering the HPs.
After trying all the HPs, he still preferred the AO out of all of them. He, with his unbiased ears, praised the AO for its huge soundstage, natural timbre, imaging and sense of space. He liked how everything "sounds natural, BIG, and can pick out where all the instruments are".
He tried the AO first, then the other HPs using the same two reference tracks, and still went back to the AO. He commented that it wasn't the last word on clarity as with the planar HPs, but he barely noticed the difference and liked everything else about it. He valued the other key sonic traits of AO more. Caldera was a close second.
Just thought it was an interesting test and how someone who is not educated about TOTL HPs, and has no expectation biases chose the AO out of all the other options purely on sonics.