Before switching night vision for thermal, I read and watched quite a lot of info. And here is what I got. Thermal devices have much more advantages before night vision, but you should understand that first of all it is used for target detection, but not identification. I am a hunter and I dont need to know which exact member of the hogs family I will kill in a few moments or to observe creatures emotions before its pass out. For these purposes you might need night vision and pretty expensive one, because Gen1 and Gen2 wont give you that clear image to identify persons face on long distances. For anything else buy thermal and you wont regret not even once. Zeus is the best you will find in this class.
This review was written in the old system and had content requirements that are different than reviews written today.