My brother and I have both had full Cheetah systems installed in our cars. Mine was about 4 years old and working perfect when I sold the car and the bro's is 3 years old and still working great. The remotes are pretty sturdy too, mine went through absolute hell and they held up nice.
I'm interested to hear anyones experience with the motorcycle versions also.
BTW, pretty sure you can pick 'em up cheaper than that on Ebay Australia.