I was considering trying to adapt one of these to work with a Clausing 8520 mill, which I believe can be done with a different adapter that could be made on the mill itself. A few people have tried to adapt regular power feeds to the Clausing, but there have been very few successes that I am aware of. I believe that with this type of power feed, I could make it work. An appropriate write up / build thread would be necessary of course.
Myself, I can live without a power feed, but being able to come up with a proper adapter and then sharing the plans and procedures with the rest of the forum would make it worthwhile.