I was on the phone with T-VIRUS today talking about the Rubies vs. the Don Post Deluxe.
As I understand it, Don Post Studios went out of business, and Rubie's bought up their intellectual property. Ironically, the Don Post Deluxe mold went to produce the Rubie's Limited Edition Vader (fiberglass).
However, the Rubie's Supreme bears little resemblance to the Don Post Classic Action (vinyl / ABS)
Rubies in a stock state compared against a Don Post Deluxe:
Rubie's after heat treatment to reduce facemask width (left):
Rubie's after heat treatment to reduce facemask width (right):