Field of view so narrow that it's not really useful for night wildlife viewing of anything that is mobile or for searching (I was trying to use it for night birds). The focus changes too much with depth. I do think that it is very cool; for perimeter security or following large animals who do not move much, it would probably be great.
A few notes: it blinds you it is so bright, even with the brightness turned down. Because both pupils constrict when one is exposed, you will lose any semblance of night vision. This means you cannot use it, move and rescan. The field of view is much to narrow to safely walk with it. So it's useful from a fixed position only.
In wildnerness/forests with no moon or man-made light, it is only useful as far as the infrared beam shines. The light amplification is great in urban settings or moonlight nights however without the infrared beam.
The device is impressive, but it takes some getting used to. Give it time to adjust both focus elements (front and rear), the contrast and brightness.http://g-ecx.images-amazon.com/images/G/01/x-locale/communities/reviews/preview-active._V192249892_.gif