I personally would rather have the ND-3 50 Sub Zero than any Gen 1. If you are going to buy a real Night Vision Scope save your coins until you can at least afford a Gen 2 and if you want the best save until you can get a Gen 3. Don't get caught up in the people who advertise Gen 4 because they don't really exist . I saved until i could afford Gen 3 with the New Pinnacle Tube. My scope is about as good as you can get in night vision. Here is the scope on one of my AR's.
http://www.morovision.com/weapons_sights/MVPA-MV-740-3P.htm