Builder ka legal track record kaise check karein?

Builder ka legal track record kaise verify karte hain sahi se? I'm looking at a flat near Yamuna Expressway, maybe Max Estate 128 II, and honestly, I know builders don't always tell you everything. As someone in real estate, I'm extra cautious for my own purchase. RERA registration numbers ke alawa aur kya check karna chahiye? Koi red flags hain jo usually miss ho jaate hain? Kya kisi ko The Hemisphere ke projects mein koi legal issues ka experience hua hai? Off the record batao, RERA complaint process kitna effective hai jab builder delay kare?