I have been lucky enough to have used most of them. This is due in no small part to belonging to ACUG (Annapolis Commodore User's Group) for years. At one point we had about 200 members, so Commodore used to send speakers and some great demos. Since the Naval Academy is so close, many Navy people would bring in overseas models too, for what that's worth.
I even got to test a Paws pre release machine.