Sohna legal checks: RERA and builder agreements, real experiences?

Honestly, I work in real estate, but buying for myself in Sohna is a completely different challenge. I'm looking at Hermitage Apartment by Sriflex Projects Private Limited, but I'm super paranoid about legal stuff. How do you guys actually verify RERA registration beyond just checking the number? Builder ka track record for compliance kaise dekhte hain, especially in Sohna? So many projects, not sure if sab ka paperwork clean hota hai. Also, what are the common red flags in builder-buyer agreements, particularly for Sohna projects? Those super area vs carpet area games toh pata hain, but any other tricky clauses that favour only the builder? And if there's a delay, is RERA actually effective? Matlab, real mein relief milta hai kya, ya it's just on paper? Share your experiences, please.