What's the real construction quality in Noida Extension projects?

Okay I'll be honest — I completely underestimated how confusing this process is. Looking at 2BHKs in Noida Extension, around ₹75L. Godrej and Gaursons are on my list. How's their construction quality and delivery track record? Heard some builders have really poor customer support after booking. Any real experiences, especially with Mahagun?