If you follow the instructions on the packet the mousse comes out lovely ie 150mls of water, blend thoroughly with an electric blender or whisk and then pop it into the fridge for 15 mins. I think that people have disasters because they do not blend it properly. I have had times when I have not blended enough and had lumps - but its like all the products a case of trial and error to get it to your own tastes. If you get it right then it is an amazing alternative to the shakes or meal packs.