I don't have a Bernina, but I think their feet are a bit different than a regular low shank or high shank foot. Make sure it will fit your Bernina before you buy!
I purchased a binding foot for my low shank machines, and found it would work well for binding things like aprons or tea towels, but did not work well for binding a quilt due to the thickness of the batting. But maybe I am just using it the wrong way...