They do seem to measure with exceptionally low distortion. Not sure if I'd hear it myself compared to existing excellent mid-woofers in the same size:
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https://audioxpress.com/article/test-bench-the-ptt6-5m08-nfa-01-6-5-midrange-from-purifi-audio
The Amazing Purifi Speaker Drivers ! Major-Breakthrough
More info on these Purifi Speaker Drivers !
https://www.stereophile.com/content/thoughts-after-munich
Purifi Drivers sound their very best in Kroma Atelier Loudspeakers and we should find out how good the all new Kroma Atelier Mercedes Loudspeakers with All Purifi Drivers! are at Munich 2023 Show !
The new Kroma Atelier Mercedes Loudspeakers are not on their web site yet but they are on You Tube 😲