Small drawback if one is very accurate: all 100% does not the 4 parts to each other, that is, for example, the rhino's ears on a poster are too large for the next poster. But does not really bother. But they fit in the overall size (4 pieces each 100 x 70 cm) together.
When gluing we use normal wallpaper paste. We papered the first time and it was not rocket science! I would recommend to stick the poster a little overlap, since they contract upon drying at the edges slightly and otherwise minimal gaps are formed between the parts!