Hey Tim,
I have owned the THor HD you are speaking of. Mine was the 640 model, is this one you are being offered?
Here's what I can say about mine. It was a good thermal that worked just as advertised. There are a lot of ATN haters out there, I'm not one of them, even though I don't own one anymore. Not saying people don't have good reason's to have those feelings due to their experiences, but my experience with their product was just fine. I will do my best to list the pro's and con's that I experienced:
Pro's:
-Great Clarity
-Lots of Options, gadgets, widgets, etc......
-On-board recording
Con's:
-I absolutely hated the LCD viewing screen. This is the reason I sold the scope. It was like a narrow wide screen, versus a nice square like all other thermals.
-Complicated menu. Yes, you do get used to it, but I thought it was idiotic that I have to click 49 times to change the scope from white hot to black hot
I'm sure there's more I'm missing from writing this, but overall the scope did me just fine. It killed coyotes and quite a few hogs.