You must just be careful getting there - once you are in the club, it is incredibly safe. I go there often when I am up in JHB as I like black WG's - I try and not leave there after 21h00 as I always worry getting out of Hillbrow.
This thread will give you a lot of info on Summit Club:
www.esa.co.za/forum/thread.php
Final word - if you do not like black or asian WG's then you are wasting your time by going there
Enjoy