Classic Mixer for easy things, for viscous content is not really suitable. I have the blender until a few times used for classic milkshakes with banana and sports nutritional supplement what has always worked well. The mixer works perfectly. A few days ago I have now begun to do Magerquark and frozen fruits to what he can not stand, because now the content was too viscous. The engine began to smoke, the shake was good though. For the price, however, you also have to be fair and should not expect too much.