I am resident of phase1 and seen many issues from day1. Builder was never shown interest to resolve the issues. It was a good part that our society has many active people and worked with builder, chased him and got few things done finally.
Major with phase1-
Sewerage treatment plant was faulty, was repaired in a year after handover
water softer not working properly from day1
Seepage issues in many flats. rooms flooded with water and people lost interior done.
Never come forward to resolve the issues rather socity has to chase and invite him to update on the issues and status
Delay in funds handover to society after more than an year of society formation.
no water harvesting pits
Finally, the builders very influencing and he says go ahead do want ever you want.
the height is builder encroached land from phase1 for phase2 can you imagine. so, less ethics and can goto any extent.
one thing is sure you would have a flat in hand, you may face same issues stated abocve.