Very nice! But I think we kinda agree that the graph is just the beginning of it....the most important is how it would sound in real life.
I would say that you or anyone from that company, better give a sample pair to the Stax Mafia such as Kerry, Birgir, Kevin Gilmore, and ask them for an honest opinions. After all, the greatest Stax Amplifiers in the world are coming from Stax Mafia and DIY folks. They are harsh, but they are honest down to the earth, just like how anyone should be when working around these High-Voltage stuff. Be neat, honest, meticulous, precise, and respect