I have two and ferment in them. They're awesome since you can put five gallons of beer in and not have to worry about a blow off tube. To transfer beer to serving keg you can make a jumper tube with a liquid fitting on each end and push with c02.
Primary: All grain pale ale, Pliny The Elder clone
Bottled:Double Noogie IPA, Amber Ale
Kegged: Brewcraft Dead Guy kit,Apfelwein, Raspberry wheat beer