A comment
I have worked with Bergauf construction mixes for a long time and I can say with confidence that they are not self-leveling. Despite the fact that the package says "Do it yourself", to work with this mixture you need experience.
Firstly, in no case should you exceed the maximum volume of water, not more than 7 liters per bag. Otherwise, the top layer will be fragile.
Secondly, if the mixture has already been prepared and has settled for the first time, then adding it to the water is categorically not recommended. Fractions will be divided among themselves, pits will appear on the floor, it will become fragile.
Thirdly, if the mixture turned out to be a little dry and has already been poured onto the floor, then you can simply sprinkle a little water on top, and in no case pour;
Fourth, the base must be primed 2-3 times with a deep penetration primer, and then again with concrete contact. Otherwise, with thin layers of 5 mm it may peel off.
pros
The only significant advantage is affordable cost.
Minuses
The mixture does not level out on its own; it is not very suitable for thin layers.