Falls under the neat toy category. Also mine failed after about 6 months of light use.

I purchased a FLIR One about 2 years ago. I’ve had great success with mine. I’ve located a hidden HVAC run, located leaky connections on ductwork, cold air infiltration in a closet...the list goes on.

The 3rd photo shows a 141 temp on a black Equinox on a sunny day.

@Cheese
I assume you have the regular One as opposed to the Pro? 

Immediate uses I have for this thing: 
1) Trying to figure out why my parents' house gets a lot hotter than it used to.  I assume the fiberglass has deteriorated in certain areas but it would be nice if I could pinpoint the trouble spots.  They're too old for the heat and I also intend to install a mini-split but feel like the insulation could be addressed too. 

2) Figuring out point of entry for a nasty rat problem at said house.

3) Figuring out source of a water leak, also at said house.

Hmm, now that I think about it, they ought to buy it for me.   

@live4ever

I bought one of these (assuming you are talking about the one that attaches to an I Phone, mine is a 6 I believe--), more for fun and something to mess around with. I have not used it or powered it in a while, if you are interested in a second hand one with barely any use let me know. I think I still have the box and can power it up to test it out first..... Jeff

@Cheese
LOL! 

So many uses!  I wonder what my wife's head temperature will read when she finds my latest Festool purchase. 

I’m sure she’ll max the unit out. 

We’ve used it to locate hot spots on the dogs before we took them to the vet. Took a couple of pictures, showed them to the vet and he easily located the problem areas. Turned out to be a grain allergy for the pooches.