Brochure promises vs possession reality

Brochures are such a scam, honestly. I'm looking at Venkatesh Skylife and other Pune projects for a 3BHK upgrade from my 2BHK. They show amazing amenities. But real mein kya milta hai at possession? My biggest worry is promised vs delivered. Kitna maintenance charge hota hai, and is service actually good ya sirf bill aata hai? Anyone faced this?