I use it every year early in the season. Sometimes at the low rate. Sometimes mix at the low rate with Indar. I’ve also used propiconazole that Scott mentioned. I’ve also noticed it doesn’t work quite as well as Indar by itself. But it is dirt cheap. I think a gallon of the generic (Bumper) was something around $100. At 4 oz. per acre, the cost per acre is somewhere around 3 dollars.
I’ve also used Ziram. It more or less has the same efficacy as Captan, but has longer PHI’s and REI’s.
Here is an old thread where some of this was discussed.