To be honest I first thought it would be a gimmick, but being able to see heat / rough temperature degrees has proven itself quite useful.

But you don't really realize it until you have it available. It's kind of like having another sense available to you.

Random examples of where it was useful:

- finding shitty chargers/electronics which were really hot while doing nothing -> wasted power

- spotting a water leak before it was visible (think cold spot in the middle of the ceiling)

- checking car tire alignment (one side hotter than the other)

- finding buried hot water pipes

- finding where cold air is leaking in during winter

- spotting damp areas

and probably others that I'm forgetting right now