I had some San Ace's back in the day, jesus they were amazing. Two paired in push/pull on a copper TRUE. The pinnacle of air cooling, and noise, for those days. Probably even still today.I want to see actual comparisons to similarly available Delta fans in the 3000-3600 RPM range, as well as comparisons to the old guard used by hardcore (besides the Deltas and rebranded Deltas); the San Aces and Nidecs. Maybe any spare GT AP-29s and AP-30s and Noctuas too.
About the only immediate advantage to this new 38mm thick fan is consumer-level PWM. Some newer Deltas or rebranded Deltas feature consumer-ready PWM, whereas San Aces and Nidecs (and Sunon, etc) use a different PWM frequency that either requires controlling via a custom PWM controller, or just voltage controlling them.