Pre-launch deals in Noida: Kya sach mein discount milta hai?

Spent the whole Sunday checking out options in Sector 51. Bamatech Realtors & Developers ka ek pre-launch offer dekha. I work in real estate but buying for myself is different. Pre-launch pricing mein kya actual discount milta hai ya just marketing hype? Construction-linked payment plan smarter hai ya down payment? Investor perspective se, kya karna chahiye?