When I had first heard about Promethean Vision, I thought it was going to work pretty differently. I thought it was going to act like a sonar almost, and instead of giving you live feedback of where they are moving, it would just return a static image of where they were at the time the wave or signal passed over them.
I figured that way you could get a good idea as to where people are, but still have a good chance of being surprised by them. In it's current state it does make me feel like the user can avoid taking a lot of risks (like moving out of cover with low shields) because they know for sure when it's safe when using it.