I picked up a sample of this to try - so fingers x'd and I'll use your tips, am going to try it with butterscotchDepends how many packs you are having tho, since if you are having 3 you can get away with doing that since all your RDA vitamins etc are in 3.
On the mousse though, I used to have it most days, it added variety, some flavours work better than other - strawberry is nice. Always mix the mix a mousse with the shake first before adding water - otherwise you get a lumpy mess! And an electric whisk makes it the best way
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It doesn't set the tetras well, some like it but most don't, I always gave a sample to someone if they only had tetras so they could try it first! There are 3 simple tricks with the mousse 1) make sure your water/milk is really cold 2) mix mousse powder in the packet of shake and mix well 3) blend the wotsits out of it with a stick blender (the ones for making soup) for AT LEAST one minute then put in fridge for 20 min. Comes out lovely and smooth! If it's lumpy or the texture in inconsistent you need to blend longer next time!