My son was charged by one while guiding a moose bowhunter two years ago. Story ends with a dead bear and a federal judge ruling justifiable self defense. I was faced up to one at close range last fall guiding an elk bowhunter. We were able to back out unscathed. What is it like? It totally changes your perspective on bowhunting in thick dark places and you don't want to bowhunt in those conditions anymore where you know bears hang out. In both of these cases the hunters did not want to hunt anymore in places where they couldn't see for over 50 yards in every direction. It's not worth the risk of dying to hunt in those places.
I used to think it would be great fun to hunt them. After being face to face with them, feeling extemely helpless, vulnerable, and inadequate in presence of such unpredictable brute power, and knowing how close you are to imminent death, I can't think of a more foolish thing to do.