I think we're pretty much in agreement, here, Wolf. I will note (probably not for you but for others following the thread) that Plangent does something very different from Izotope RX (which I have and is amazing), Waves restoration, etc. It uses a super sensitive head on a modified tape deck to extract the latent bias signal that resides under the signal at a very high frequency. Given that the bias signal is very stable, any variations in tape speed from wow and flutter is represented in variations in the bias tone on the tape. Plangent reads the bias and then reverses the fluctuations in speed, resulting in an analog sound that gains some of the benefits of a digital signal, in terms of an extremely stable time function. RX and Waves can do a lot to clean up the sound but they simply can't address things like this.
I'm still not sold on 24/192 but I am sold on the improved converters. But, with the mastering done on most pop records today, it's all wasted. But hopefully people will hear the horrible distortion from unconscionable limiting and demand cleaner masters. Cleaner masters coupled with the Pono/Ayre converters will result in a greatly improved musical experience. It would be very cool if the converters could be accessed by a digital input so that other sources could utilize them. For me, personally, I have Metric Halo and Grace Design converters in my systems already, so there's no need to replace them; I want this to succeed to see an improvement in the media I can play back.
Pono: Every Persons HD Audio Playback?!