Hi Chareen, Anja is right, this is a great diet for some but doesn't suit others. It makes you take responsibility for your eating, so OK you can eat "what you want" on your UDs, but if you eat double the calorie intake you need you will put on weight rather than lose it. No diet is magic, you have to find what works for you.
That said I am finding it great. I am losing about a pound and a half a week, which is around half what you would get on a VLCD - makes sense since you only diet half the time. You can use CD packs for your DDs if that suits you, but remember you will not get into ketosis and might feel hungry - just keep telling yourself "I can eat tomorrow". And there isn't the sense of failure with this that there is with CD, that moment when you find you've eaten something you shouldn't doesn't mean the diet is over, you just eat less for the rest of the day or accept the losses will be a bit less this week.
So if you want a diet where you can sometimes eat and drink normally and have the social fun that entails, and are prepared to accept the daily scale fluctuations, and can avoid going mad on UDs and keep the DDs strict then YES - this is the one for you and welcome aboard.