Sohna property: Builder track records and hidden costs?

Visited a few projects in Sohna last week, honestly trying to figure out the whole home buying scene. Fed up of renting, landlord raised rent again, so finally taking the plunge. My budget's around 1.5 Cr for a 2 or 3 BHK. Dekh raha hoon DLF, M3M, Emaar, Godrej ke projects. But I'm super worried about project delays. Has anyone here had experience with these builders' on-time delivery in Sohna? Matlab, jo date dete hain, woh pakka hoti hai ya kaafi delays hote hain? Also, construction quality ka kya scene hai after possession? Sunn raha hoon log bolte hain plaster cracks, seepage issues aate hain. Aur hidden charges ka kya? PLC, EDC, sab kuch clear hota hai ya last minute pe nikalte hain naye kharche? Just trying to do my homework before committing to EMI. Any advice ya personal experience would be super helpful!