I have a Uniden GPS 301 model system which detects fixed red light and speed camera around Australia/New Zealand in all states and cities. It fits in the front of your dash via a suction cup on your windscreen which runs to the ciggarette lighter for power so no installation is required. It also detects black spots, overspeed warning system eg over 100km, distance travelled, distance to the set city, compass, mark and save any location etc etc. It can also be use to point exact location to set your goto mounts. This unit can be updated which means if your state government decides to spend tax payers money on more speed cameras, it can still be detected.
It is 100% legal in all states as it is just a GPS receiver. I bought it from Tandy Electronics about 2 years ago and works like a treat which saved me from a few speeding tickets already

. Comes with box, cables, instructions etc .
Key Features:
Early Warning Safety System – Nationwide Coverage
Protect your loved ones and your licence
3 stage visual and audible warning system to maximise safety
Speed camera warning
Red-light camera warning
Black spot warning
Over speed alert
Global Positioning System (GPS) Technology
GPS direction to more than 5000 pre-programmed Australian and New Zealand cities and suburbs
Mark and delete up to 500 of your own personal locations, speed camera, red-light camera or black spot locations
Flash memory for points of interest and warning location database.
Database updates via the Internet
Global Positioning System (GPS) Technology
Display current speed
Determine average trip speed
Record maximum speed
Calculate estimated time to reach destination
Built-in electronic compass with GPS co-ordinates
Here's a review of the unit I found:
http://autospeed.drive.com.au/cms/A_2422/article.html
I am asking
$150 + postage which is about 1 speeding ticket worth