I use Gigabitfilm from time to time but not anymore in 4x5 only in 35 mm and fast and sharp lenses.
It is actually a very good film for high contrast scenes if I remember correctly it can cover a contrast of 11f stops.
But in the beginning days there has been some troubles with the developer and so I use it only in Xtol now.
There is no grain for focusing by the enlarger part, but I have to do further testing in XTol.