I used F76+ for many years in the 80s and 90s, the camera shop I shopped had a contract with the local school district which preferred F76 and I got the same price the school paid, just over wholesale, I found it to similar to D76, grain and contrast about the same at 1 to 7, somewhat more acutance when diluted 1:19. F60 was closer to DDX and Tmax. At the time I shooting a lot film, used a bottle every couple of months, but once opened it was only good for a few months.