Confused about pre-launch vs waiting, Greater Noida

Since last Diwali, I've been eyeing properties in Greater Noida. I work in real estate, but buying for myself is a whole different ballgame, yaar. Inspire Associates Yamuna Expressway pe kuch naya project laa rahe hain, aur pre-launch offers kaafi attractive lag rahe. Honestly, not sure if early bird discounts are actually substantial ya just marketing hype. Kya kisi ko real experience hai pre-launch pricing mein kitna save hota hai compared to open-market rates? Matlab, is it worth locking in early for a 2BHK around Sector 22A, ya wait karke spot discounts ya price correction zones mein better value milegi near Jewar infra? Builders bolte hain no negotiation, but does anyone actually manage to get a good chunk off the final price on the table? Need some honest gyaan, please.