Builder delays: What RERA *actually* does for buyers

₹35,000 rent for a 2BHK in Gurugram, and landlord ne phir increase kar diya. I'm so fed up of renting, finally decided to buy something. Looked at M3M Landmark Avana on Dwarka Expressway, project looks good, but builder delays ka darr lag raha hai. I've heard so many stories about builders not delivering on time, even with RERA in place. Matlab, agar M3M bhi delay karta hai, what are my *real* legal options? Is RERA actually effective ya bas paper pe hi hai? How do people even check a builder ka legal track record properly before signing anything? Anyone faced delays with M3M or similar builders and actually got justice through RERA? Kya process hota hai?