My commute to work includes several miles on a multi-use rail trail. I thought a cheerful little bell was better than yelling "on your left" at walkers and runners. I've had it for several years. It seems get people's attention from 50' away, and they usually move to the side with a smile on their faces.
That said, it's not perfect. The mounting is a little hokey, it tends to rotate around the bars, and some technique is required to get the best sound. So when I bought a new bike, I thought I'd get a "better" bell. But the 1-1/4" bars limit my choices, and here I am buying another of these.