I used open sights early in my hunting career, but have been using a scope for quite a few years now. For me it was a matter of being able to see antlers on a deers head. A scope is real useful in that regard. I used to use a 3x9, but after not getting a shot on 2 dandy bucks that were running at very close range, I've since dropped down to a 1.75x5 and a 2x7. This has not been a problem since. I am now a firm advocate that when hunting in the "brush" you don't need anything above a 2x7. That's more than enough.

Mr. .45-70