PuteriWorld,
Sunway is one of the leading property developers in malaysia. There are in a different league compared to UEM, Gamuda etc..
Sunway has a proven track record in KL, they don't build houses, they build communities, with their own police force, they bring jobs through their universities, hospitals, them parks, shopping malls, and most importantly, they bring public transportation (they are building a BRT line in Kl to connect Bandar Sunway with KTM/LRT stations ).
So, given that the HSR station will be less than 5 km away from SUnway Iskandar, you can expect the core of the city to be seamlessly connected to the HSR station by public transport.
Really, sunway is the most appealing project in nusajaya, the one that excites me the most.