I went to the 'summer school' lectures, they were okay. I wouldn't bother going again unless I lived in Sydney (live 5-6 hours away, so total cost for the week including the lectures and accommodation etc. was probably just under $1000). Only went to the Chemistry and English lectures, I found chemistry more valuable than English as they tended to go on about the same stuff we learn in class, and the different topics/modules people do (having to spend time on each one) is annoying!