A long time ago (more than 20 years ago), I did some contract work for a company who was doing a joint development with Dubner and I was involved with that project. Unfortunately I can't remember anything about their keyboard feel. Probably pretty ordinary or I would have remembered it. I don't recall the keyboards being huge monsters like that though. The systems were just titlers though, not editors, so didn't require so many special keys. They made some good hardware with respect to their boxes.