I was one of the participants of the IED class. I must say that it really makes you think given all the potential booby-traps that can be contained in an IED: Mercury switches, motion detectors, redundant ignition systems, false leads, temperature sensors, etc..
Looking at the X-ray, trying to make a determination of the contents and working on a render safe procedure in real time is difficult to say the least.
I actually found myself sweating a little trying to render the device safe...
...Suffice it to say, I was one of the casualties of the operation, since I violated the first rule...don't move the device.
The only downside was that the class was only 4 hours (if that can be considered a downside) and there is so much information that Mike has (and his brother who is a Bomb Tech and helped design the class) that it really just scratches the surface of this topic/skill.