Since reading about VRS, I'm sure I've seen it occasionally with my Phantom, before and after removing the prop guards. Wind gusts seem to be characteristically different than VRS. I've noticed it most when descending straight down. So now I tend to avoid vertical descents. Has anyone had a quad drop from VRS? It was interesting to learn that one of the copters involved in the mission which got Bin Laden apparently crashed due to VRS.