I was skeptical about bear spray at first, I figured it couldn't be that effective and the only the worse than a bear coming after me was a bear who was pissed off because I sprayed him in the face.
I've since read up on it and become sufficiently of the combination of it's effectiveness, the advantage of the wide spray pattern and the concept of being able to give the bear a second chance that I got a can.
That said, I still carry my pistol because I figure if I spray the bear (or lion) and it doesn't stop, I better be able to kill it.
I was working in the San Francisco Bay Area when they found that mountain lion that had killed one or two joggers and attacked another one. Since then, I've heard about several other incidents with them, so I'm not going to take any chances.