As the others have said, this diet works! I'm on week 12 and I'm 37lbs down, and that's with cheating too.
And regarding how the diet works, it's 3 packs a day, you can choose from shakes, soups, bars and there's porridge and pasta too. There are some new meals coming at the end of June apparently. You have 3 packs a day and that's it, no other food is allowed if you're doing Total Solution. You can have water (you should drink 2-3 litres of plain water a day), black coffee, black tea/green tea/peppermint tea. You're allowed Coke Zero but some people find the sweetness makes them crave food and for some people it slows down their losses. The only other thing you can have is something called Boullion (it's made by Marigold and it's an organic powdered vegetable stock/soup).
If you dont think having packs only will suit you then you can do Working Solution which is the 3 packs plus a low calorie, low carb meal. The Exante website seems to be offline at the moment but if you go to exantediet.com and look at the Plans section it explains them there, and also look at the FAQ which explains lots.