And according to someone elses he needed to take various bits off anyway, however that's not the problem, you will still need to take various items off (bag, handbag etc) and wait in the queue to go through like you do now. Al most airports if someone hasn't got all their things people behind just go through the scanner ahead of them. However as I mentioned before I think it's the people going through the scanners that slow the line down and if scuzi is right then I can see it being at least 30seconds for the person to get in, twirl, walk out and be told they can go, whereas now it's about 10-20 seconds to get through a scanner.
I can see their reason for usng it in a security sense, however I think the time saving side is a load of *******.
And also, when do you show your passport at security anyway.