I've heard that Model F have a nicer feel than Model M but this is my first experience with an F. I'm typing this on a 1391401 M, & have had several over the past decade, but this type F keyboard has such a great feel. And the entire keyboard feels much more solid.
It seems to be in good mechanical condition - both flip-up feet are fine and all the keycaps are firmly installed, the cable & strain relief look good. I might build or buy a converter to see if it really works.