The range is good, in general, but it performs poorly in low / no light conditions.
Where it is useful is close range / lighted conditions... for example, I was looking at the electrical panel with it the other day at the range house, and could easily see one overloaded switch as well as a breaker that was over 150F.
Neat.
If you want to see the stuff in a dark environment: Forget getting a clear picture... you'll get a blob and far worse definition than seems to make sense. At distance it seems to be hard to distinguish anything...