CGHS Mayfair: Post-booking support and resale value confusion

Budget finalised, loan pre-approved – ab CGHS Mayfair pe atka hoon. I work in real estate but buying for myself is totally different, I know builders ke marketing spin. Specifically looking at CGHS Mayfair Apartment. Kya kisi ka experience raha hai CGHS Group ke saath after booking? Matlab, customer support kaisa hai? Phone uthate bhi hain ya sirf sales tak ka rishta hai? I'm worried about post-booking communication, especially if there are any delays. Also, RERA compliance record kaisa hai inka? Koi legal cases ya consumer complaints toh nahi hain? Resale value bhi important hai mere liye, 5-7 saal mein kya expect kar sakte hain? Dwarka mein toh demand achhi hai but builder ka track record matter karta hai. Any honest opinions, off the record? Thanks!