Yes I have tried it and it does work to a degree. However, leaves you feeling very hungry, it's expensive and it has lots of additives.
It's okay for a short term fix i.e. to lose a few pounds before holiday etc., but otherwise I wouldn't bother.
Now, if I need something to give me a kick start etc., I use Slender Blend, from Protein World. Better product (vits, minerals, protein, carbs etc.,) far better taste, more flavours and works out cheaper.
Lost about a stone, last summer, with this.