We have the MUM 5X with 900 watts now 14 days in the (test) use. The machine proposes pretty good egg snow, only one cream that is not as airy as desired, with stirring and shortcrust it comes pretty well clear. But even at moderate yeast dough they feel sorry and heavy bread dough she twists the way that the dough hook comes in Kontact with the bowl, as it is only a matter of time when it comes to breaking. In short, it is not recommended and there's no question of engine power. All in all good, heavy doughs better knead for most assignments manually. Does not keep all its promises.