Noida first-time buyers: What was your biggest shock?

Since last Diwali I've been drowning in property research. Stellar One Phase II looks good, but under-construction ka risk kaun lega yaar? My parents keep saying Unibera Towers is ready-to-move, but total cost of ownership seems tricky. Builder ka track record bhi dekhna hai. Not sure if an upcoming project's final cost is truly better. Anyone faced hidden charges after possession?