I put one on a .50 Beowulf for a while. Here is a brief video taken with my cell phone behind the scope while watching deer. There is some image bloom on the recording that wasn't actually in the scope.
Here are my take aways from using the scope.
It is comparable to slightly better than a 320 resolution 19mm FLIR PS32 spotting scope even though it has actual less resolution, but it has a much larger display. There were times I could spot animals better with the Echo than I could with the PS32, though the PS32 did a better job of showing objects in the background.
I shot hogs at over 100 yards with it, no problem. I could have shot farther but didn't get the opportunities.
It has a narrower FOV than I would expect for the magnification. That makes it harder to pick up running animals.
This scope can handle much more recoil than most other thermal scopes that are usually only rated to .308.
Controls are easy to use.
Unit is compact and light (compared to other thermals).
The user is definitely backlit by the scope. I would stalk with it covered and then uncover when setting up for a shot so as to reduce the amount of time I was backlighting myself.
This is not a high dollar thermal scope. I would suggest that unless you have a need for a scope that can handle a lot of recoil, you might be better off going with a Pulsar Apex XD38a or XD50a for a bit more money, but for what I think is the best bang for the buck. You would get better capabilities and a better image with the Pulsars and they can handle up to .308.