Hi, I'm a newbie user curious about AMT too..... Interesting posts. I'm comfortable with the fact that these are manufactured outside the US, and even more so following the revelations about American manufacturers in bed with intelligence agencies (who might have a vested interest in sabotage of competing currencies).
What I'm a little leery of, is the fact that AMT has been dark as far as communicating for as long as I've seen their site up. I placed an order for their 1.2 THs machine around Christmas, and haven't heard anything from them, besides an automated "thanks for your order" email. So, I've got $7000 USD burning a hole in my pocket, that I'm getting ready to dump in my Mt. Gox account instead of saving it for the AMT order.
Any one else out there have any experiences like that?