I brew exclusively 2.5-4 gallons, i fell in love with using kegs as fermenters and thats most i can safely ferment without making a mess, plus it allows me to brew more often and i use my stove for boiling, easier/quicker to chill, and perfect for me, i fill my kegs with boiling wort( carefully as to not splash) and use a old cooler filled with ice to chill takes 25-30 mins to get to pitching temps for ale and maybe 45 mins for lager give or take but slower then ising a IC or CFC but one less thing to clean and works fine for me and super easy dont need a chiller or anything