Noida Extension builders: hidden costs & delays?

Noida Extension — I'm based in Dubai, so site visits are impossible. Looking at Godrej, ATS, and Gaursons for a 2BHK, maybe in Sector 137. My main concern is hidden charges at possession, like unexpected PLC or EDC. Are these builders transparent? And their delivery track record? Heard stories about big delays. What's the real ground truth?