We had sniper kits that were theater provided that had 4 sets of Canon 10x42 L in them. Not sure how many other SS teams used them before us, but I'm guessing at least three. We used them daily and in every extreme imaginable, we loved them. Unless you are sitting on a static range watching paper targets, Stabos were invaluable. Those things were banged around, thrown, dropped, and given everything years of abuse could dish out, and the only issue we had was the battery compartment not staying shut on one of the units, 100mph tape fixed that. I was beyond surprised at how well they held up.
Low light they worked just as well as are Leupold spotting scopes.
Hope this helps