So far I've used the Laut formulas with Kodak,Fuji,Agfa and Konica film. Pro,consumer and even cross processed E-6 film. My only complaint is the cross processed is too neutral. But that may be something I'm doing. Others have used the formulas for I guess 7+ years. Considering how few films have managed to last that long I figure they've tried more then one film with the formula.