Faridabad RERA: Kya yeh sirf formality hai?

Honestly, even though I'm in real estate, buying for myself in Faridabad is a different ball game. I'm looking at Puri Constructions or Adore RealTech in Neharpar, but legal checks are stressing me out. RERA registration number dekhna enough hai kya? Yaar, builder-buyer agreement mein kaun se clauses pe dhyaan dena chahiye jo builder apne favour mein rakhta hai? Aur agar delay hua toh RERA complaint file karna worth it hai? Real mein kuch hota bhi hai ya bas paper pe hai? Any practical tips from Faridabad buyers on this?