On occasion while instructing VRS will be demonstrated for any student or pilot that wants to gain the real world experience. I will not even consider doing it less than 4,000 agl as vertical descents can be in excess of 6,000 fpm....which can leave minimal time to recover when deep into VRS.
I am dismayed by the lack of knowledge from pilots that can not see the difference between VRS and settling with power (FAA term), which really should be insufficient power.....it is still taught in the US, that they are one and the same....!!!?!?!