I own an A1 for some years, I’ve bought it together with an MA motor drive because I wanted the portrait mode grip and second release button together with the aperture priority.
When it started to drain the batteries when I did not switch it off within a day, I tried to get another one, which had the EE EEEE error.
Also both A1s have broken battery doors.
To be fair, I must say that the first A was a bit beaten up, the brass coating came out underneath the black paint, but on the other side this to me is a sign that the camera did not hum up through missing use.
So now I got an New F1 together with the power winder, so again I got aperture priority and the vertical grip.
Of course the f1 is much better build and even though mine saw heavy use (even the paint on the lever is off) everything feels accurate and works fine.
One big advantage is that the Power winder only uses 4 AA batteries so it is much lighter than the A1 with MA motor drive and it’s 12 AA batteries (of course only 2 frames per second but I never shoot in continuous mode).
One big disadvantage of the F1 is, that if you are shooting in aperture priority mode you can not illuminate the match needle in the finder. Since I am shooting a lot indoors and at night I am thinking of installing a little led light on top of the viewfinder which shines on the light window which illuminates the match needle of the finder.
Anyway I believe that you will hardly find a more rugged 35 mm camera than the New F1 and I am sure that it will still work and be serviceable in the next 40 years.