Ghaziabad builders: What's the real story on delivery and hidden costs?

Has anyone actually gotten possession from Gaurs or ATS in Ghaziabad on their promised date? I'm so fed up of renting, landlord raised rent again, so I'm finally taking the plunge. Looking at 2/3BHKs around Raj Nagar Extension or Siddhartha Vihar, budget max ₹90L. I'm checking out projects by Gaurs, ATS, and Gulshan Homz. What's the real deal with their delivery timelines? Do they actually hand over on time, or is it always delayed by years? And post-possession, what's the construction quality like, honestly? Heard stories about seepage and plaster issues with some builders later on. Also, any nasty surprises with hidden charges like PLC or maintenance deposits at possession time? Trying to avoid any shocks, you know?