It is a really good track, quite suitable for street cars. It used to be a bit rocky and would tear up your tyres but since they re-did the track during the year, it's now brilliant. It beds down into a very hard clay surface which your tyres will squeal on. Semislicks work great on it.
If anyone wants to have a crack at an autocross, just get in touch with the Ipswich West Moreton car club that runs the track and find out when their next event is, then go out for a look, ask question to see what requirements there are for your car and for yourself (including licences etc) and then rock up at the next one and have fun.
You easily hit over 100kph down both the front and back straights.