I would jump on this guys. MSRP will be $89 (want to keep it out of the triple digits.)
The Tari mod is actually the only HD800 mod that acts as a transducer. It was painstakingly developed over years of painstaking development. It is based on an obscure paper written by the grandchild of someone working for Western Electric in the 1800's. Deciphering it was hard, and required the help of a similarly precocious grandchild of a nominated Mathematics professor at a distinguished university in Newfoundland. I'm obviously keeping things as vague as possible to keep competitors from reverse engineering the process.
As the diagrams show, this modification, called the TARI mod (Transducer Also Research Iatromathematics) is truly unique and bothers to address the basic questions that no one asks as they think it makes them sound "dumb." This is the chief reason science has been such a stagnant field the last 50 years.
But don't take my word for it. Your ears will give you the proof that your brain may have a hard time accepting.
One caveat is that those in the Southern hemisphere may have a reversal of sound signature from those in the northern hemisphere, due to coriolis effect. We are working on a workaround to this so I would hold off on buying for now.