Sunway's campus is well-maintained. Excellent library, reasonably clean campus. Cafeteria food sux. Nice eateries outside campus. Lots of rich kids, so it's a motor fair every morning at the carpark. Education-wise, hmm...I had a few excellent lecturers for my A-Levels, not sure about Ausmat. Awesome hostel (if you stay in the condo). Overall, it's a good place to study if you don't get distracted with stuff in and around Pyramid... If you want me to rate it out of 10, i'll give 9 for quality of life and 7 for academic strength.
Good luck.