Not many people use these enzymes. As you have posted in the wine and cider forum, I presume you mean for breaking down something starchy to make wine. I did this once, back in March, to make 12 bottles of banana wine, but used alpha amylase as this is what was available at my local shop. I don't really have much else to say. It helps breaks down the banana flesh into something that is easier to strain, and it creates fermentable sugars.