Scopes are a great aid, especially for older folks with failing vision (or others with similar vision). When I could no longer effectively use iron sights I got a 1.5 to 4 power variable scope. The 1.5 is great for the woods where shots are are short. 4 power is plenty of magnification for up to 300 yds. I wouldn't recommend the 3-9 power scopes. You'd rarely use the 9 power and lose the short range speed you usually use in the woods.
Cogito, ergo armatum sum