Do you have experience with ATN Thor IV? say the largest objective, and highest power?
What is so much better it is worth the extra money, and how is it different, in terms of range, identification, etc?
If you want good thermal or IR you should look at FLIR or TNVC. ATN is a cheap toy by comparison. That’s from experience. I haven’t tried the Thor 4 and I see it’s in the $3k range. In the same range you will find FLIR Systems Thermosight Pro PTS736. Much better quality and optic, IMO.