I started yesterday and my first shake was the best because i was at home and used a hand held blender thingy.
Then got to work and at lunchtime made up a mint choc drink - it turned out awful, loads of lumps in it.
I made a soup last night and made it into a paste first and then added the extra water, that turned out quite well.
It does all dissolve eventually but you need the patience to keep stirring it.