Pre-launch discounts are just a hidden charge trap.

Prestige Group ke new projects mein pre-launch deals kitni real hoti hain? I'm in a 2BHK in Koramangala, thinking of a 3BHK upgrade. Builder sales team says 'early bird' is best, but kya hidden charges baad mein surprise karte hain? Like OC/CC ya utility deposits. Is it worth the perceived discount, or better to wait for ready-to-move?