I ordered a FLIR ONE a while back and received it a couple of days ago.
So far I'm fairly impressed. The integration of visible-light edge detection information makes the image look a lot better than one might think given the relatively low (80x60) resolution of the IR sensor.
Interestingly, the FLIR Tools app (free download from the Apple app store) reveals quite a bit more information than the FLIR ONE app. I tried imaging a sub-freezing solution (crushed ice + bourbon for those who might wish to repeat this most enjoyable experiment) and the most I could get from the FLIR ONE app was "<32ºF". Saving this image to the camera roll and then opening it in FLIR Tools revealed a measured temperature of 11ºF. It could well be that the accuracy is badly compromised outside the rated range, but it's interesting that the information is available at all.
The news is not all good, however.
Like many folks, I'm also anticipating the release of the next iPhone. I found a Lightning extender cable (the CableJive dockXtender; $26) and have successfully used the camera separated from my iPhone 5S and connected via the cable. The unfortunate thing, though, is that the FLIR ONE software checks the device model on which it's running and simply displays an error if it's not an iPhone 5 or 5S. So I could not, for example, run the software on my iPad Air even though there's no technical reason why it shouldn't work.
I tried opening a case with FLIR support that explained I'd successfully used a Lightning extension cable, suggesting that the compatibility message be turned into a warning rather than completely preventing the app from running on hardware that was electrically compatible with the camera.
The results were predictably discouraging.
They almost immediately sent me a form-letter response telling me the device wasn't made to fit upcoming iPhone hardware and that it wouldn't work for that reason.
After I wrote back to gently suggest they read my original message more carefully, they again responded--suggesting this time that Apple developer licensing rules prevented them from doing this.
I pointed out that there was a big gulf between endorsing/recommending/supporting an extension cord solution and simply updating their software so that it didn't break unnecessarily when a user tried to do something unsupported but nonetheless useful. Their final reply to this suggestion was, and I quote, "Thank you for your comprehension." I'm glad that they feel I comprehend, but my confidence in their comprehension remains somewhat low.
The device has a 30-day return policy, so I'll hold on to it for at least another couple of weeks. If it looks like they're going to update the app software to permit my very tame unsupported use, it's a great device that I'll keep with no hesitation. But if there's no sign of movement on a very basic concession to users like me, I'll probably wind up returning it.
Phil