The fact that AOs are illegal in most places speaks volumes of how ignorant lawmakers are of the real world and how political weapons laws are. They're written up by people with no street smarts or common sense.
A knife that opens at the push of a button is less dangerous than a baseball bat or even a two foot piece of pipe you can get at a hardware store. If I wanted to take someone out, it would be easier to do with either one of these implements.
But some idiot congressman dreamed these knife laws up because they thought it would make them appear to be "tough on crime", and get a few more votes.
It's the same thing with weapons laws. Criminals will always be able to get their guns through the black market, but it's becoming harder and harder for law-abiding citizens to obtain them through legitimate means.
As for AOs, I consider the prices to be too high to justify buying them. For the price of a Microtech, you can get a nice little revolver, even some semi autos, or several manual or assisted opening knives. I'm not going to drop $400-$500 bucks on a knife!