Yep I used to have them on the profilers I had and they really did help, really make the world a brighter place and enable people to be seem more easily.
i use an amber lense for tourneys they are very helpfull when in dull conditions slightly annoying (often headache inducing) in light bright conditions.
I do not use them for reffing/marshalling as i find that orange or yellow paint is hard to spot plus the colours are all saturated yellow which is annoying at times. So i tend to use clear for reffing/marshalling when i can be arsed to actually do that
I would advise against wearing amber lenses in forrests that are mainly pine trees. when the pine needles fall on the floor and go brown it is impossible to see anything from all the glare!