I have these things all around my property. Like Goalie Dad said, It was cool at first. Then when My trash cans started getting crushed, my mirrors broken off my trucks while they climb on the hood and to top it off one particular bear started chasing and trying to tackle my horse !!!
Needless to say, I wasn't going to stand around and watch my horse get killed by a bear.
I finally got 2 large dogs that live outside and that ended my bear problem, atleast around the house anyway. I still have a major problem with the bears taking over my deer feeders but I can live with that..