Greater Noida investors — hidden costs and pre-launch reality check?

Pre-launch deals in Greater Noida seem too good to be true, ya phir I'm missing something big. I'm based in Dubai and can't do site inspections easily, so relying on you guys for ground truth. Saw a Decent Buildwell project in Noida Extension, 2BHK around 70L. But is that the *real* all-in cost? Builder quotes are always just the base price, right? What about stamp duty, registration, PLC, and all those hidden charges that pop up at possession? For an investor like me, ROI tabhi clear hoga jab total cost pata ho. Is pre-launch pricing genuinely better, or just a marketing gimmick for new projects near Jewar Airport? Also, what about legal clarity on older projects, say in JJ Colony, for someone who needs a property manager? Koi experience share kar sakta hai?