Millenium - I am in the process to audition an updated Genesis directly to my stock unit. This is THE only way to get a handle on how any changes might result from the upgraded unit. I already know the value of going through a modification process vs. starting from scratch with a "new and superior" product.
I sense just a little bit of anxiety in your response, as if there is some history with you having unsatisfactory results with modded gear ... and it took Aberdeen to finally do this "correctly". I will wait to hear a modified piece in the context of my system and pass judgement only then.
As for the use of the TACT products, I have read about them but not heard them. I enjoy CD playback but it is secondary to my LP playback system. And this with the Aesthetix front end into CAT amps and SoundLab speakers is not likely to change anytime soon. Putting A/D and D/A conversions in my preamp/amps is not likely to happen anytime soon. So for me anyway, if a digital bandaid from a decade ago can improve the sound of CD playback, and get me closer to the 3-dimensionality of my LP playback, AND .... only costs me $400-500 (typical cost of Genesis on the used market), then you better believe I'll go for it. And oh my, now I am considering a modification to the bandaid. Stay tuned.
Why not write Mr. McGowan to get the answer to your final question? His company is quite successful with a new line of amps, cables and PLCs, etc. I suspect he already has his hands full with all these new devlopments. What may have been an exciting engineering challenge for him then with the Genesis, may no longer peak his interest at all. Or maybe there's not enough demand to work on a new generation of such a product. It could be due to anything here. So why not write to him and find this out for yourself? Why did Goldmund so obruptly stop the Reference TT shortly after Harry Pearson reported the Versa Dynamics to be the superior TT? The audio scene is full of unanswered questions.
John