I have not but I have a few Jack Harrison bows that I think are pretty nice. Guys I have spoke too about Fisk made Harrison bows have, in most part not said kind works about them. Not sure why. Maybe because Jack made such a nice bow it would have been hard to improve or match that quality. Jack still does by the way make a bow, the HSS, but a very limited number of them.
If you still would like more info on this subject, send me a PM and I'll get you a contact name and email address of a person that truely knows "all" the facts about the two bow makers.