Positive
You see anything alive with a heat source within the units detection range.
You can scan quickly , rabbits, foxes, deer, with there back to you, doesn't matter, you see it, unlike NV were you sometimes need eyeshade.
I can detect rabbit sized heat sources with for example a Helion XQ50F at 600yds
They are totally covert, no IR source is needed.
Compact units with great battery life.
Rapid Target acquisition when trying to get on target, LOTS quicker than NV , also very fast multiple shots
You can shoot into woodland no issue if you can see i