I also had a very bad experience with the Marg properties. I booked a flat at Marg Utsav about 2 years back and due to unavoidable circumstances had to cancel it. I raised a cancellation request early 2012, they assured that they would repay the amount within three months but still now(Oct 2013) I have not received a single bloody rupee from them, it is more than 1.5 years. They keep saying that they do not have funds which is sick and they do not treat us with respect once they had received the money.
Also, I enquired few others who had booked flats at Marg, they said that they have not received proper documents even after paying the full amount.
You might wonder why I have written negatively about Marg, the answer is simple "Just want to make sure nobody else gets screwed like me".
Well, If you have lots of money, you can go ahead, coz they will not repay you back.