Also, probably the reason why it took so long to develope the thing is because they had to get all of those features down pat. For example getting it to recognize the size and shape of the intruder and to analyze it to see if it's just simply a little bird or someone climbing the fence. Also from the sound of it it is a bit hard to set up, with all of those sensors and springs and such.
Who knows?
Also I like the idea of it for home use. "GET THE HELL OFF MY LAWN!" and such ;P
To be God is to be Root, if someone is erking you just type: rm -d /home/heathen