I have yet to get a green one, but I own a Greatland Red Laser Flare. It is very impressive and I hear the green is even better. We played with mine during a training exersize and from a little over a mile away (per GPS) it presented to the observer as a big red light "as big as a stop sign" and was easily visable. The observer noted it was more visable than either my SDU 5/E or MS2000 strobe when observed with the naked eye, but was less visable through night vision.

In my opnion, worth the money if you are going to be traveling in the back country. But get a PLB first!