Like others I also got lured by less price. I also thought the same thing - first project so they will deliver on time and with good quality. Forget about the delivery and quality, the builder is asking 8.5 lakhs extra (with tax it would be around 9.5 lakhs) to pay; and there is no guarantee that we will get the flat even after paying this ransom (this is ransom only) amount.
Flats are not yet ready (was promised to deliver in Nov/Dec 2012), and the way work is going on it will not be ready at least in one year. There is no other option left apart from going to consumer court. People planning to buy flat with this builder, please do not waste your hard earned money.