RE: Would you use one of these, if you had one?
I remember mentioning before on this site that I'd like to have one for one reason.... recovery. Being colorblind, I'd have to call someone in to follow a blood trail if one went very far. I'd never actually use it to hunt, but it would beat depending on someone else or spraying a quart of hydrogen peroxide all over my hunting site searching for the trail.
Heck, I'd want one even if I didn't hunt. How many times in your lives have you just wanted to know what was out there in the dark? Not because you're afraid, but just because you want to know. I think it'd be an awesome gadget to have.