Noida Extension projects: Pre-launch prices are a total trap

Honestly, pre-launch offers in Noida Extension seem shady. My friend booked a flat with Gaursons, claiming huge discounts. But OC delays dragged on for years. Now, the resale value is lower than promised. Unhone bola tha ki investment acha hai. Is it just Gaursons, or are all pre-launch deals risky? Should I stick to ready-to-move-in properties only? Kisi ko same experience hua hai kya? I'm confused. Ab samajh nahi aa raha.