I have to say that FWH has made a huge difference in my IPA and DIPA brews, especially. The hop flavor comes through in a much more pronounced way. Whole hops seem preferable but I have had good luck with pellets, too. I generally throw in two ounces when the hop Alpha Acid (AA) is between 6-9% and 1-1.5 oz. when AA is above 9%. After I collect my first runnings I throw in the hops and get the wort moving up toward boil. Then I'll batch sparge and add these second runnings to the boil kettle with the FWHs and keep it cranking toward boil.