I used the Free Dwarf formation in a tournament. I thought it wasn’t bad, the Brutal is nice, but the nimble also lets your shieldbreakers be more maneuverable. I didn’t use it for charges but did use it to position better a fair bit - e.g. doubling then turning can be very important. Plus the free Scout on the spear levy now, in combo with other units makes them semi-usable.
Tournament report with Free Dwarfs using formation here: