I used one for a while.
While technically the resolution is less than a 320 scope, the image was better than on my FLIR PS32 handheld spotter. The scope will hunt.
The downside are many, however.
Contrast control was not great.
Despite being a 1x scope, the FOV was fairly narrow. As a buddy of mine who hunted with it for a while said, "It would work well for folks who hunt from an elevated blind over a feeder, but the backlighting on your face really lights you up and so for stalking it is tough to use and the narrow FOV makes running shots difficult."
It has an automatic NUC function that runs on a 30 second cycle once it is warmed up. It has a little countdown time that is in the corner of the display to let you know when the next NUC is about to occur. As with other scopes, the screen freezes for a second or two during NUCing. You don't want to be firing when it is NUCing or about to NUC.
I had mine mounted on a Beowulf .50. It handled the recoil nicely. I had to extend my stock fully and mount the sight forward in order to be far enough back to see the image clearly without my reading glasses.
I found the red screen to be the one that backlit me the least...
Here is a hog I shot at 85 yards and another at 70 yards...
Cleric, most or all thermal scopes will tend to look pretty darned good, at fairly short distances, such as with many indoor venues. I have suggest a couple of my vids above. You might also check out some of the others on Youtube. For the money, I think I would go with an actual scope thermal over the Echo 1 unless you are thinking of putting the scope on something like a .458 Socom or .50 Beowulf.