Greater Noida projects: Real experiences with builder delivery timelines?

Since last year, I've been watching Greater Noida's market closely, especially around Sector 150 and Noida Extension, with Jewar Airport driving considerable interest. I'm considering a 3BHK, targeting ₹1.2-1.8 Cr. From my experience, timely project delivery and actual construction quality are paramount. I've noted instances where projects from some builders, like Gaursons and ACE Group, have faced significant delays, which impacts investment projections. I am currently evaluating Godrej and ATS. What are the community's recent experiences regarding their on-time delivery track record in Greater Noida? Additionally, concerning construction quality, have buyers encountered consistent issues such as seepage or finishing problems post-possession? Hidden charges are another critical concern; I am particularly cautious about unexpected PLC or EDC demands. Any insights on their post-booking customer support or RERA compliance would be highly appreciated. I aim to mitigate potential risks associated with project execution.