I started with a ANPVS2 then as the tech went up tried to keep up. The actual clearest I have used was a Russian gen one(think) had a big ole obj lense , troops from Latvia that I was training had them, About 25 years ago I bought my first one, a Litton that looks just like a PVS 14 but was not called that at the time and is a touch bigger, looks just like one.. I have used it off and on for those years and it still works great. No gain control but must be gated as it cuts out on to much light, has a IR ilum, on-off-IR flip switch. Then I picked up a less money , armsight PVS 14 kinda lower end. Only 1 grand new with case. It works OK not quite as good as the old Litton but close. I'm not connected any more but when I was I tried a lot of foreign NVG,s some are real good. I would like to see the new combined Heat, Magnetic res., NVG combo units, they claim you can see thru walls . That concerns me a little of misuse. But I wish I could afford the tech.