All these erudite comments were fun to read. I can't help comparing with guitar enthusiasts who are looking out for really old Fenders and Gibsons to get the authentic old fashioned sounds. To my mind the value of a DX7 is just like that. It has a sound relevant to its time in history. It is what it was and has a soul of its own. Has time and technology produced more sophisticated instruments? Sure, but I don't think that's the point.