Scout scopes arent all that new, and Cooper didnt invent the concept. I saw a few old Winchester 94's as a kid with forward mounted pistol scopes, and the Germans had a small, forward mounted scope on some K98's.
I have a couple of rifles with them, a Savage Scout and an M1A SOCOM with one on ARMS lever rings. They are great on rifles where you might jump some thing and want to snap shoot, or make quick shots in general. They can be less than great in fading light, or with the sun low behind you.