Builder reputation in Noida Extension is often misleading

Noida Extension keeps coming up every time I shortlist something. I'm finally taking the plunge after being fed up of renting; my landlord raised rent again, so the EMI vs rent math actually makes sense now. I'm looking at 2BHKs around ₹70-90L in sectors like 137 or 150. I'm trying to compare builders like Godrej, ATS, and Gaursons. Does anyone have recent experiences with their project delivery timelines? Honestly, I'm worried about construction quality – plaster cracks or seepage issues after possession are a nightmare. And what about post-possession maintenance charges? Are they reasonable or do they become an extortion? Any insights on Mahagun or ACE Group's quality control would be helpful too. I just want to avoid future headaches.