Under-construction flats: Builder payment plans ka kya karein?

Dwarka — been eyeing a 3BHK here for ages, but builder payment plans ka scene samajh nahi aa raha. I work in this industry, but buying for myself is different. D S Properties ka ek project hai, bolte hain 2 saal mein possession, but construction-linked plan mein har month kuch na kuch aata rehta hai. Last time, aise hi ek deal mein phasa tha. Super area vs carpet area games alag. Is it even worth going for under-construction anymore after all the delays? Ready-to-move ka premium bhi high lag raha. Kya karein?