My Sohna flat: What nobody tells you about the final price

Since getting possession in March, I've been meaning to share this. Jab main Signature Global Park 1 le raha tha, advertised rate per sqft kuch aur tha, but with all the hidden charges, PLC, and actually usable area, it shot up. My builder quoted ₹66.58L but final cost was closer to ₹78L for my 2BHK. It's a proper end-user society, which is a relief. For those who considered Signature Global City 92, did you face similar jump in actual price? Also, how are the amenities there, are they actually useful ya bas brochure pe achhe lagte hain? Hope this helps someone avoid sticker shock.