Hidden charges they won't tell you about till OC

From my experience, always triple-check the OC charges, especially in Noida. Bamatech Realtors & Developers for example, quote one thing initially, but then PLC and other hidden charges crop up during possession. Is it worth fighting them, or just paying up? Also, is Sector 126 actually worth the premium now? I've seen the rental yields are not that great. What are your thoughts? Hope this saves someone some headaches. Anyone else experienced this?