I had a bad experience while booking my flat with Gopalan Enterprises and hence moved to Prestige Park View project which has a far better location and amenities with little higher price. I have wasted my 2 months time with Gopalan and they returned my booking cheque stating that they dont want to sell few flats now. They will sell them on higher price when project will be near completion.
I have not heard any other case where any builder first took the cheque and confirmed the booking and later cancelled the booking unilaterally.