I have been very happy with my little thermal camera, and I use it routinely on my workbench. However, I don't recommend that you build one like mine. The pushbutton power switch is really annoying - if you drop something on top of the camera, or lay it face down on the table, the unit will turn on, then quietly drain the batteries until they are dead flat. This has the nasty side effect of corrupting the flash memory of the ItsyBitsy microcontroller, so you have to open up the case and re-flash the firmware. Speaking of firmware, mine is a bit janky, and I simply do not have the time to go back and tidy it up. The Adafruit examples are the best place to start if you want to build a DIY thermal camera using this sensor.

There is a much better project at https://hackaday.io/project/189728-diy-pocket-thermal-imager

I am not affiliated with this work, but it does everything I want, and generally does it better than my version. I have the microcontroller PCB in my drawer ready for my design to finally die... though I will probably still hack Ruslan's project to use a pair of AA cells instead of a lithium battery :-)